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CVE-2023-24880 is a Windows SmartScreen security feature bypass vulnerability in which a specially crafted malicious file can evade Mark-of-the-Web enforcement on affected Windows systems. By bypassing MoTW propagation or recognition, the vulnerability prevents downstream protections that rely on that trust marker from activating, including Windows Defender SmartScreen checks and Microsoft Office Protected View behavior. Microsoft reported the issue as publicly disclosed and exploited in the wild. Exploitation requires convincing a user to open the attacker-supplied file on a vulnerable Windows version.
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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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Windows SmartScreen security feature bypass vulnerability referenced as part of a set of SmartScreen zero-days.
A previously patched Windows SmartScreen vulnerability referenced as part of a series of SmartScreen zero-days.
A Windows SmartScreen/MoTW security feature bypass that can prevent MoTW-dependent protections from triggering when a user opens a malicious file, potentially enabling payload execution.
Windows SmartScreen security feature bypass that allows a malicious file to bypass Mark-of-the-Web protections; reported as actively exploited with public exploit availability.
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.