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CVE-2022-41091 is a Windows Mark of the Web (MOTW) security feature bypass vulnerability. MOTW is implemented using an Alternate Data Stream tag applied to files originating from untrusted zones and is relied upon by downstream protections such as Microsoft Office Protected View and related security warning flows. The vulnerability allows an attacker to craft a malicious file so that MOTW-based trust decisions are bypassed, causing the file to evade protections that would normally be applied to internet-originated content. Microsoft and multiple reporting sources described the issue as publicly disclosed and exploited in the wild in November 2022.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Microsoft vulnerability that CISA KEV’s knownRansomwareCampaignUse field silently flipped to Known during 2025 (evidence of ransomware campaign use).
A Windows Mark-of-the-Web (MoTW) security feature bypass that can allow malicious files to evade MoTW-dependent protections (e.g., Office Protected View); reported as actively exploited and weaponized by Magniber.
A Windows Mark-of-the-Web (MoTW) security feature bypass that can allow crafted files to bypass protections such as Microsoft Office Protected View (requires user interaction).
Security feature bypass vulnerability in Windows Mark of the Web (MOTW).
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.