Is CVE-2022-41091 (Microsoft Windows Mark of the Web (MOTW) Security Feature Bypass) being exploited in the wild?

Yes. CISA added CVE-2022-41091 to its Known Exploited Vulnerabilities catalogue on 8 November 2022, which it does only when there is reliable evidence of active exploitation. CISA lists it as known to be used in ransomware campaigns. Microsoft Windows Mark of the Web (MOTW) contains a security feature bypass vulnerability resulting in a limited loss of integrity and availability of security features.

How to confirm that CVE-2022-41091 is actively exploited

The practical answer starts with confirmation from authoritative sources, not with rumor or exploit chatter. For this CVE, the key signal is inclusion in CISA’s Known Exploited Vulnerabilities Catalog, because that catalog is reserved for vulnerabilities with reliable evidence of in-the-wild abuse. You should also cross-check the record against the official CVE Program and the NIST National Vulnerability Database for the canonical identifier and descriptive details.

Because the issue is a Windows Mark of the Web security feature bypass, confirmation is not just about whether the patch exists. It is also about whether your environment still allows files to arrive, move, and execute in ways that can evade zone-based warnings or other protective prompts. That makes exposure assessment a matter of both asset inventory and execution-path review.

What the MotW bypass means for defenders

Mark of the Web is a Windows trust signal attached to downloaded content. When that signal can be bypassed, a file may behave more like locally trusted content than a file sourced from the internet, which can weaken the warning layer users rely on before opening documents, scripts, archives, or shortcuts. The practical security consequence is not that every affected file becomes malicious, but that the environment’s trust boundary around downloaded content becomes easier to abuse.

For defenders, that matters because MotW bypasses tend to be used early in a kill chain, where the goal is to get a payload opened, launched, or staged without the usual user friction. In campaigns that use drive-by downloads, phishing attachments, or lures packaged as compressed files, the bypass can be the difference between a blocked execution path and a successful initial foothold.

When you assess impact, focus on the downstream control that MotW was supposed to support, namely safe handling of untrusted downloads. If that control is weakened, the next questions are whether endpoint protections, script controls, attachment handling, and user workflow restrictions still compensate for it.

What to do if patching or mitigation has to wait

If remediation cannot happen immediately, treat the issue as an exposure-management problem, not a cosmetic advisory. Tighten where files are allowed to come from, how they are transferred, and which execution paths are permitted for downloaded content. Apply the strongest available Windows hardening baseline you already use, and review whether browser, mail, collaboration, and archive-handling paths still leave users with easy routes to open untrusted material.

At minimum, prioritize systems that regularly receive external files, systems used by high-value users, and systems that can reach sensitive internal resources if a payload executes. If you need a practical baseline for those controls, use the Windows Endpoint Hardening Guide and the Endpoint Hardening Checklist to verify that the surrounding protections are not relying on MotW alone.

Risk and Threat Considerations

This CVE matters because the bypass attacks a trust signal that users and security tools often treat as a first-line guardrail for internet-originated files. If that guardrail is weak or inconsistent, the main failure mode is quiet execution of content that should have been handled more cautiously, especially in phishing and lure-based delivery chains.

Failure mechanism: An attacker delivers content that should carry internet-origin markings, then relies on the bypass to reduce the warning or blocking effect that would normally apply when the user opens the file.

Impact: The likely result is easier initial execution of malicious content, which can lead to payload staging, credential theft, persistence, or later movement if the file is opened on a system with meaningful access.

Standards & Framework Alignment

This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.

NIST CSF 2.0 and NIST SP 800-53 Rev 5 set the governance and control requirements practitioners need to meet.

Framework	Control / Reference	Relevance
NIST CSF 2.0	PR.IR-01 — Platform Security	MotW bypass exposure depends on endpoint and content-handling protections.
	DE.CM-01 — Continuous Monitoring	Active exploitation needs monitoring for suspicious file execution and delivery paths.
	RS.AN-01 — Incident Analysis	Known exploitation requires analysis of whether affected systems were abused before patching.
Recommendation — Harden endpoint platforms to reduce trust-boundary bypass exposure for downloaded content. Monitor file-delivery and execution activity for signs of exploitation. Analyze exposure and potential compromise on systems that handled untrusted files.
NIST SP 800-53 Rev 5	SI-3 — Malicious Code Protection	A MotW bypass weakens malware filtering and execution safeguards around downloaded files.
	SI-10 — Information Input Validation	Downloaded content handling and file processing are central to this bypass scenario.
Recommendation — Strengthen malicious code protection for internet-originated files and attachments. Validate and constrain file-handling paths that process untrusted input.

Practitioner Guidance

What to verify: Confirm whether your Windows estate still depends on MotW behavior for downloaded files, archived attachments, and files moved between trust zones. Pay special attention to mail gateways, browser downloads, file shares, and collaboration tools, because those are the paths where this bypass becomes operationally relevant.

Decision rule: If a system receives untrusted files from outside the organization and cannot be patched immediately, treat it as high priority for compensating controls and post-delivery monitoring rather than waiting for perfect remediation. The more users can open code-bearing or macro-enabled content on that system, the more urgently you should tighten execution and review paths.

What practitioners underestimate: Feature-bypass CVEs are often dismissed as “just a warning issue,” but the real question is whether the bypass removes a hesitation point that stops malicious content from being launched. In practice, that can be enough to turn a low-friction lure into a successful compromise attempt.

Practitioner takeaway: Use the KEV listing as your operational trigger, then judge the real risk by how much your download and execution workflow still relies on MotW to slow or block dangerous content.