5 Critical Cybersecurity Threats Every Remote Worker Faces in 2026

The rising cost of remote work security gaps

When millions of workers shifted to remote work, they brought corporate data into home offices, coffee shops, and shared spaces — environments that were never designed with enterprise-grade security in mind. Attackers noticed immediately.

According to IBM's Cost of a Data Breach Report, breaches involving remote work now cost organizations an average of $1.58 million more than those involving on-premises workers. That gap has widened every year since 2020, and in 2026 it shows no sign of narrowing.

The reason is straightforward: remote workers operate outside the protective perimeter of corporate firewalls, IT monitoring systems, and physical security controls. A remote laptop connecting to a home router running outdated firmware, authenticated with a reused password, is an attack surface that didn't exist at scale before 2020.

What has changed most dramatically in 2025 and 2026 is the sophistication of the attacks themselves. Cybercriminals now use AI to craft personalized phishing emails that pass every intuitive test a worker might apply. They clone voices and faces to impersonate executives. They deploy ransomware that encrypts backups before touching primary files. The threat landscape that remote workers face in 2026 is not the same one from three years ago — and outdated advice will not protect you from modern attacks.

This guide is written for remote workers, freelancers, IT managers, and small business owners who need a current, honest assessment of what the real risks are and what actually works to stop them.

The 5 critical cybersecurity threats at a glance:

| # | Threat | Risk level | Primary defense | |---|---|---|---| | 1 | AI-enhanced phishing & social engineering | 🔴 Critical | Security awareness training | | 2 | Unsecured home networks & public Wi-Fi | 🟠 High | VPN + router hardening | | 3 | Ransomware & endpoint malware | 🔴 Critical | EDR + offline backups | | 4 | Weak authentication & credential theft | 🔴 Critical | Passkeys + hardware MFA | | 5 | Shadow IT & unsanctioned apps | 🟡 Medium | CASB + IT policy |

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The 5 critical cybersecurity threats

1. AI-enhanced phishing & social engineering — the threat that has changed everything

What it is: Phishing — tricking someone into clicking a malicious link, entering credentials on a fake site, or transferring money under false pretenses — has existed for decades. What changed in 2025 and 2026 is the application of AI, which has made phishing attacks faster to produce, harder to detect, and startlingly personalized.

How the attack works: A traditional phishing email was easy to spot: generic greeting, bad grammar, a suspicious domain. Modern AI-enhanced phishing starts with reconnaissance. Attackers scrape LinkedIn, company websites, GitHub, and social media to build a detailed profile of their target — their job title, their manager's name, the tools their company uses, recent projects they've posted about. The AI then generates a perfectly written, contextually relevant email impersonating a known contact.

The most dangerous variant in 2026 is Business Email Compromise 2.0 — where attackers use AI voice cloning or video deepfakes to impersonate a senior executive. In several documented cases, employees have received video calls from a convincing deepfake of their CFO, authorizing urgent wire transfers or credential resets. By the time the fraud is discovered, the money is gone and the attacker has vanished.

Real-world impact: The FBI's Internet Crime Complaint Center reported that Business Email Compromise losses exceeded $3 billion in the past year alone. Phishing remains the entry point for over 80% of all data breaches, and AI has made mass-personalization possible — meaning thousands of highly convincing attacks can be launched simultaneously, with no human effort to write them.

Warning signs to watch for:

• Urgency language ("Act immediately," "This expires in 1 hour")
• Requests to bypass normal approval processes or verification steps
• Familiar-sounding but slightly off email domains (support@c0mpany.com vs. company.com)
• Any request for credentials, MFA codes, or payment via email or phone
• An unexpected video call insisting you act on something sensitive before the call ends

How to protect yourself:

• Establish a verbal verification protocol for any financial or credential request — always confirm by calling a known number, never one provided in the suspicious message
• Use email clients with AI-based phishing detection (Microsoft Defender for Office 365, Proofpoint, or Google Workspace's built-in filtering)
• Enable DMARC, DKIM, and SPF on your company's email domain — this prevents attackers from spoofing your organization's address
• Treat any deepfake video call requesting sensitive action as suspicious by default — hang up and verify through a separate channel
• Complete phishing simulation training quarterly, not annually — familiarity decays quickly

Risk level: 🔴 Critical. This threat requires behavioral change, not just a tool purchase.

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2. Unsecured home networks and public Wi-Fi — the invisible attack surface

What it is: Your home router is the gateway between your devices and the internet. Most people set it up once, never change the default admin password, never update the firmware, and leave it running for years. In 2026, that router has become one of the most exploited entry points in enterprise breaches that begin at the edge — with a remote worker's home.

How the attack works: There are two primary attack vectors here. The first is the compromised home router. Attackers scan the internet for routers with default credentials or known firmware vulnerabilities (which are published in public CVE databases). Once inside a router, they can intercept unencrypted traffic, redirect DNS queries to malicious servers, or use the device as a launch point into the broader home network — and from there, to corporate systems the remote worker is logged into.

The second vector is the public Wi-Fi attack, specifically the "evil twin" hotspot. An attacker sets up a Wi-Fi network named "Starbucks_WiFi" or "Hotel_Guest" in a public location. When unsuspecting workers connect, all their traffic passes through the attacker's device first. This is called a man-in-the-middle (MITM) attack, and it allows the attacker to capture session cookies, credentials, and sensitive data — even from HTTPS connections in some configurations.

Real-world impact: A 2025 study by Armis Security found that over 65% of home routers used by remote workers had at least one unpatched critical vulnerability. The average home router goes more than 18 months between firmware updates — a window that attackers exploit aggressively.

Warning signs to watch for:

• Your router's admin panel still uses default credentials (admin/admin, admin/password)
• Your router firmware hasn't been updated in over six months
• You notice devices on your home network you don't recognize
• Websites that normally load over HTTPS suddenly show certificate warnings
• Your internet behaves strangely when connected to a specific public Wi-Fi

How to protect yourself:

• Change your router's admin username and password immediately — use a unique, strong password managed in a password manager
• Enable automatic firmware updates on your router, or check for updates monthly
• Use a reputable VPN on all devices when working from public networks (NordVPN, Mullvad, or ProtonVPN are strong choices)
• Set your home Wi-Fi to WPA3 encryption if your router supports it; WPA2 minimum
• Create a separate guest network for personal devices, smart home gadgets, and any non-work hardware — keep work devices on their own isolated SSID
• Never conduct sensitive work on public Wi-Fi without a VPN active

Risk level: 🟠 High. The fix is largely technical and one-time — update, configure, then maintain. The risk is high because most remote workers haven't done it.

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3. Ransomware and endpoint malware — when your laptop becomes the door

What it is: Ransomware is malicious software that encrypts a victim's files and demands payment — typically in cryptocurrency — to restore access. In 2026, ransomware has evolved far beyond the crude "pay us or lose your files" model. Modern ransomware operators steal data before encrypting it, threaten to publish sensitive files publicly, and specifically target backup systems to eliminate the victim's exit strategy.

How the attack works: For remote workers, the most common entry points are phishing emails with malicious attachments, drive-by downloads from compromised websites, and exploitation of unpatched software vulnerabilities. Once ransomware lands on a remote worker's personal laptop, it doesn't stay there. It scans for connected network drives, cloud sync folders (including Dropbox, OneDrive, and Google Drive), and any accessible corporate systems. A single infected laptop can encrypt corporate cloud storage and propagate across a VPN-connected company network within hours.

Ransomware-as-a-Service (RaaS) has made this threat accessible to criminals with no technical skill. Platforms like LockBit, BlackCat, and their successors operate like franchises — providing malware, infrastructure, and even customer service in exchange for a percentage of each ransom paid. This has dramatically increased the volume and sophistication of attacks at every level.

Real-world impact: Ransomware payments exceeded $1 billion globally in 2023, and the average recovery cost — including downtime, incident response, and remediation — is now over $4.5 million per incident, according to Sophos's State of Ransomware report. Nearly 70% of ransomware victims in 2025 reported that the attackers had stolen data before encrypting it.

Warning signs to watch for:

• Antivirus or security software is suddenly disabled or blocked from updating
• Files appear with new extensions you don't recognize (.locked, .encrypted, or random strings)
• Computer becomes unusually slow or disk activity spikes without explanation
• You receive a ransom note file on your desktop or in folders
• Cloud sync starts uploading enormous amounts of data unexpectedly

How to protect yourself:

• Install endpoint detection and response (EDR) software — free options like Malwarebytes are a baseline; Microsoft Defender (built into Windows) is adequate for most personal devices when properly configured
• Maintain the 3-2-1 backup rule: 3 copies of important data, on 2 different media types, with 1 stored offline (a disconnected external drive or an offline cloud backup)
• Keep your operating system and all applications updated — ransomware operators exploit known vulnerabilities that patches already address
• Disable macros in Microsoft Office documents from unknown sources
• Segment your home network so a compromised personal device cannot reach corporate systems directly

Risk level: 🔴 Critical. Offline backups are the single most important defensive measure — without them, recovery options are limited to paying the ransom or losing your data.

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4. Weak authentication and credential theft — the easiest door in

What it is: Despite years of warnings, weak passwords and poor authentication practices remain the leading cause of unauthorized account access. In 2026, the threat has evolved beyond simple password guessing. Credential stuffing, SIM swapping, and MFA fatigue attacks have made even users with "strong" passwords and multi-factor authentication vulnerable — if they're using those tools incorrectly.

How the attack works: Credential stuffing is an automated attack where criminals take username and password combinations leaked from previous data breaches and try them against hundreds of other services. Because most people reuse passwords, a breach at one website frequently gives attackers access to email accounts, banking apps, and corporate VPNs. The scale is staggering — databases containing billions of leaked credential pairs are freely available on the dark web.

MFA fatigue (also called "push bombing") is a newer and increasingly effective technique. The attacker already has the victim's username and password, and begins logging in repeatedly, triggering push notification MFA requests on the victim's phone. They do this late at night or in rapid bursts until the victim — frustrated or half-asleep — approves the notification. The attacker is then in.

SIM swapping involves convincing a mobile carrier to transfer the victim's phone number to a SIM card the attacker controls, giving them access to SMS-based two-factor codes.

Real-world impact: Microsoft reports that MFA fatigue attacks increased by over 300% between 2023 and 2025. The 2023 MGM Resorts hack — which cost the company an estimated $100 million — began with a social engineering call to the IT help desk, exploiting weak identity verification practices.

Warning signs to watch for:

• MFA push notifications you didn't trigger arriving on your phone
• Notifications that your password has been changed when you didn't change it
• Login alerts from unexpected locations or devices
• Being locked out of accounts you actively use
• Receiving SMS codes you didn't request

How to protect yourself:

• Use a password manager (Bitwarden is free and open-source; 1Password is excellent for teams) — generate a unique, random password for every account
• Switch from SMS-based MFA to an authenticator app (Authy, Google Authenticator) or a hardware security key (YubiKey) — these are immune to SIM swapping
• Enable passkeys wherever supported — passkeys are phishing-resistant by design and eliminate the password entirely
• For MFA push notifications: if you receive one you didn't trigger, deny it immediately and change your password — do not approve it to "make it stop"
• Check haveibeenpwned.com to see if your email has appeared in known breaches, and change passwords for affected accounts

Risk level: 🔴 Critical. A password manager and phishing-resistant MFA together eliminate the majority of credential theft risk. These are the two highest-ROI security improvements any remote worker can make.

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5. Shadow IT and unsanctioned apps — the risk you're creating yourself

What it is: Shadow IT refers to software, services, and devices that employees use for work without the knowledge or approval of their IT department. In a remote work context, this is endemic. Workers use personal Dropbox accounts to share files because the corporate file-sharing system is slow. They install productivity apps from browser extension stores. They use personal phones without mobile device management. Every one of these choices creates a data exposure risk.

How the attack works: The risk here is less about external attackers and more about uncontrolled data exposure. When a remote worker copies a confidential client spreadsheet into their personal Google Drive to work on it from their home computer, that data now lives in an account the company cannot monitor, secure, or remotely wipe. If that personal account is compromised, the client data goes with it.

Browser extensions are a particularly underappreciated threat vector. Many free extensions request permissions to read and modify all data on websites you visit — which means a malicious or compromised extension can capture everything you type, including passwords and confidential documents, and send it to a server the extension developer controls. The 2025 Chrome extension supply chain attack affected over 30 extensions and compromised data from more than 600,000 users.

Additionally, when workers use unsanctioned SaaS tools, their employers cannot enforce data retention policies, comply with regulatory requirements (GDPR, HIPAA), or respond effectively to data subject requests.

Warning signs to watch for:

• Using personal cloud storage for work files because the corporate system is inconvenient
• Installing browser extensions without checking their permissions or the developer's reputation
• Using personal messaging apps (WhatsApp, Telegram) for work conversations because Slack is "too formal"
• Accessing work email or systems from a personal device that has no security software
• Sharing login credentials with a colleague because "it's faster"

How to protect yourself:

• Audit the browser extensions installed on your work browser — remove anything you don't actively use or can't verify the source of
• Use work-sanctioned tools for work tasks, even when they're less convenient — if the tools are genuinely inadequate, raise this with IT formally
• Keep work and personal accounts strictly separated — use separate browsers (Chrome for work, Firefox for personal, for example), or separate browser profiles
• If you must use a personal device, install the company's MDM (mobile device management) solution — it allows IT to secure work data without accessing personal files
• Report accidental data exposure to your IT team immediately — the cover-up is almost always more damaging than the original incident

Risk level: 🟡 Medium. The technical risk is lower than the other four threats, but the compliance and reputational risk — especially in regulated industries — can be severe. This is also the most controllable threat because it is almost entirely behavioral.

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Threat comparison table — risk at a glance

| Threat | Risk level | Most common target | Primary defense | Avg. recovery cost | |---|---|---|---|---| | AI-enhanced phishing | 🔴 Critical | All remote workers | Awareness training + email filtering | $4.9M (IBM, 2025) | | Unsecured networks | 🟠 High | Mobile / hybrid workers | VPN + router hardening | $1.2M (Armis, 2025) | | Ransomware & malware | 🔴 Critical | Unpatched endpoints | EDR + offline backups | $4.5M (Sophos, 2025) | | Credential theft | 🔴 Critical | All users with reused passwords | Password manager + FIDO2 MFA | $3.8M (IBM, 2025) | | Shadow IT | 🟡 Medium | Teams with inadequate tooling | IT policy + CASB enforcement | Varies (regulatory) |

Three of the five threats are rated Critical — meaning they are high-frequency, high-impact, and actively exploited against remote workers today. The good news: all five have practical, low-cost defenses. The checklist below covers them all.

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The complete remote worker security checklist for 2026

This checklist covers every major defensive action across the five threat categories above. Completing all items moves you from average-risk to significantly hardened. None of these require expert technical knowledge.

Network security

• Change your router's admin credentials from the defaults (do this today if you haven't)
• Enable automatic firmware updates on your router; check the manufacturer's app or web portal
• Set Wi-Fi encryption to WPA3 (or WPA2-AES minimum)
• Create a separate guest network for non-work devices
• Use a reputable VPN (NordVPN, Mullvad, or ProtonVPN) whenever using public Wi-Fi
• Enable DNS filtering via NextDNS or Cloudflare 1.1.1.1 for Family — this blocks known malicious domains before your browser even loads them

Device security

• Enable full-disk encryption (BitLocker on Windows, FileVault on Mac) on all work devices
• Set your device to lock automatically after 2–5 minutes of inactivity
• Keep your operating system and all applications fully updated — enable auto-updates where possible
• Install endpoint protection: Microsoft Defender is adequate for most; Malwarebytes Premium adds a strong second layer
• Never use work devices for personal activities (streaming, gaming, personal banking) — and vice versa

Account security

• Install a password manager and migrate all work accounts to unique, randomly generated passwords — Bitwarden (free), 1Password, or Dashlane are all excellent
• Replace SMS-based MFA with an authenticator app (Authy, Google Authenticator) or a hardware key (YubiKey) for all critical accounts
• Enable passkeys on every service that supports them — passkeys cannot be phished
• Check haveibeenpwned.com for breach exposure and rotate passwords for any affected accounts
• Never share login credentials with colleagues — request IT to set up shared accounts properly if needed

Behavioral security

• Apply the "SLAM" method to every email: check the Sender, Links, Attachments, and Message for anomalies before acting
• Verify any financial or sensitive request through a known, separate communication channel — never trust the contact details in the request itself
• Report suspicious emails, calls, or messages to your IT security team — do not delete them, as they are evidence
• Complete your company's security awareness training proactively, not just when compliance requires it
• Trust your instincts: if something feels wrong about an email, a call, or a request, pause and verify before proceeding

Company policy — questions to ask your IT team

• Do we have a VPN, and am I required to use it for all work?
• What is the approved list of tools and apps I should use for work communication and file sharing?
• What is the incident response procedure if I suspect my device has been compromised?
• Does the company offer a password manager or endpoint protection license I can use?
• Am I allowed to use personal devices, and if so, what MDM solution do I need to install?

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How the threat landscape has changed since 2022

To understand why these threats are so much more dangerous now than they were when remote work began at scale, it helps to see what has changed in the underlying technology and criminal ecosystem.

AI made social engineering scalable. Phishing used to require human effort — writing convincing messages, managing responses, customizing lures. AI eliminates that bottleneck. An attacker can now generate thousands of highly personalized phishing emails simultaneously, train voice clones on a ten-second audio sample scraped from a public YouTube video, and simulate video calls using deepfake technology that was undetectable as recently as 2023.

Ransomware became a service industry. Ransomware-as-a-Service platforms now operate with affiliate structures, service-level agreements, and customer support portals. The barrier to launching a ransomware attack dropped dramatically. What previously required advanced technical skill now requires only a payment and a target list.

MFA is no longer sufficient on its own. Multi-factor authentication was a significant defensive upgrade when it became widespread. But MFA fatigue attacks, SIM swapping, and adversary-in-the-middle (AiTM) proxy tools — which can intercept and replay MFA codes in real time — have made many MFA implementations defeatable. Phishing-resistant MFA (hardware keys, passkeys) is now the standard security teams recommend.

Supply chain attacks expanded to SaaS. Attackers have learned that compromising a widely-used tool can expose thousands of downstream victims simultaneously. In 2025 alone, major supply chain attacks affected users of popular browser extensions, a widely-used DevOps platform, and several SaaS productivity tools. Remote workers who use many cloud tools have a correspondingly larger attack surface.

Zero trust became the mandatory framework. The old security model — trust everything inside the corporate perimeter, distrust everything outside — is dead. Zero trust architecture assumes breach by default and requires continuous verification of identity, device health, and access rights for every request, from every location. In 2026, organizations that haven't begun zero trust adoption are operating at significantly elevated risk.

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What employers and IT teams must do to protect remote staff

Individual responsibility matters, but remote work security cannot rest entirely on employee behavior. Organizations that have sent staff home without the right tools and policies are exposing themselves and their employees to avoidable risk.

Mandate security awareness training — and make it good. Annual compliance-checkbox training does not work. Quarterly, scenario-based simulations that include current attack types (AI phishing, deepfake calls, MFA fatigue) are measurably more effective. Run simulated phishing tests, track improvement over time, and provide targeted coaching to employees who fall for them — without shaming.

Provide the tools employees actually need. Shadow IT is often a symptom of inadequate sanctioned tooling. If employees are using personal Dropbox because the company file system is unusable, fix the file system. Provide company-licensed password managers, endpoint protection, and VPN as standard-issue to all remote staff — not optional extras.

Enforce zero trust access. Replace blanket VPN access to the entire corporate network with identity-aware, application-specific access controls. An employee whose job is writing marketing copy does not need the same network access as an engineer with database privileges. Least-privilege access limits the blast radius when any single account is compromised.

Implement privileged access management (PAM). Accounts with administrative privileges are the most valuable targets in any attack. PAM solutions ensure that elevated credentials are time-limited, logged, and require additional verification — so even if an admin's primary account is compromised, the damage is contained.

Create an incident response plan employees can find in 60 seconds. Most employees do not know what to do in the first five minutes of a security incident. A clearly documented, easily findable plan — "I think I clicked a phishing link, here's what to do right now" — significantly reduces the damage from successful attacks. Distribute it prominently, not buried in an intranet folder nobody visits.

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Frequently asked questions

What is the biggest cybersecurity risk for remote workers in 2026? AI-enhanced phishing and social engineering is the single biggest threat, both by frequency and potential impact. The combination of near-perfect impersonation, deepfake voice and video, and mass personalization at scale has made social engineering more dangerous than any technical vulnerability. The most important countermeasure is training and verification protocols — not technology.

How can remote workers protect themselves from phishing? The three most effective protections are: using an email client with AI-based phishing detection, applying the "SLAM" check (Sender, Links, Attachments, Message) to every suspicious email, and always verifying requests for sensitive actions through a separate, known communication channel. Hardware security keys provide the strongest technical protection by making credential theft physically impossible even if you click a phishing link.

Is working from a coffee shop Wi-Fi safe? Not without a VPN. Public Wi-Fi is fundamentally insecure — it is accessible to anyone, and the risk of an evil twin hotspot or man-in-the-middle attack is real. With a reputable VPN active and HTTPS-only browsing (enforced via browser settings), the risk becomes manageable. Never access banking, corporate systems, or sensitive accounts on public Wi-Fi without a VPN.

Do I need a VPN if I work from home? For home use specifically, a VPN protects you from your ISP monitoring your traffic and provides a layer of protection if your router is compromised. It is strongly recommended for any work involving sensitive data. For all public network use, it is essential. Look for a no-logs VPN with a published audit from a reputable firm — NordVPN, Mullvad, and ProtonVPN all meet this standard.

What is a zero trust security model? Zero trust is a security framework that operates on the principle of "never trust, always verify." Instead of assuming that anyone inside the corporate network is trustworthy, zero trust requires every user, device, and connection to continuously prove identity and compliance before accessing any resource. For remote workers, it typically means shorter session tokens, device health checks at login, and access permissions limited strictly to what each role requires.

How do I know if my home network has been hacked? Key warning signs include: devices you don't recognize in your router's connected devices list, unexpected slowdowns in your internet speed, DNS settings that have been changed without your action, and browser certificate warnings on sites that normally load cleanly. Log into your router's admin panel periodically and review the connected devices list — anything you can't identify is worth investigating.

What should I do if I accidentally click a phishing link? Act immediately: disconnect your device from the internet (turn off Wi-Fi or unplug the ethernet cable), do not enter any credentials on the page that loaded, run a full antivirus scan, change the password of any account that uses the same credentials, and notify your IT security team. The sooner you report it, the more options exist to contain any damage. Do not wait to see if anything bad happens — assume it has and act accordingly.

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Conclusion — security is a habit, not a product

The five threats covered in this guide — AI-enhanced phishing, unsecured networks, ransomware, credential theft, and shadow IT — represent the most significant cybersecurity risks remote workers face in 2026. Three of the five are rated Critical, meaning they are actively exploited, frequently successful, and expensive to recover from.

But the most important insight from this guide is that the gap between vulnerable and protected is not as large as it seems. A password manager, a hardware MFA key, a regularly updated router, a reputable VPN, and a trained habit of pausing before clicking are — combined — more effective than most enterprise security tools deployed without user buy-in.

Technology protects you from technical attacks. Behavior protects you from human ones. In 2026, the most dangerous attacks are human ones, enhanced by AI. The most powerful defense is the same: a human, trained to notice and verify before acting.

Review this guide every six months. The threat landscape will change. The fundamentals will not.

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Sources: IBM Cost of a Data Breach Report 2025 (ibm.com/security); Verizon Data Breach Investigations Report 2025 (verizon.com/dbir); Sophos State of Ransomware 2025 (sophos.com); Armis Remote Worker Security Study 2025 (armis.com); FBI Internet Crime Complaint Center (IC3) 2024 Annual Report (ic3.gov); CISA Remote Work Security Guidance (cisa.gov).