Win32k Elevation of Privilege Vulnerability in Windows Win32K - ICOMP
CVE-2026-33840 is a Microsoft Windows Win32k elevation-of-privilege vulnerability affecting Windows Win32K - ICOMP. The flaw is a use-after-free condition (CWE-416) in the Win32k subsystem. Microsoft describes it as allowing an authorized attacker to elevate privileges locally. Based on the provided context, exploitation requires local access and low privileges, does not require user interaction, and can result in execution in a more privileged security context. No further public technical detail about the specific vulnerable routine or trigger path was provided in the supplied content.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An important Win32k elevation of privilege vulnerability that Microsoft determined is more likely to be exploited.
A Microsoft Windows Win32K use-after-free elevation of privilege vulnerability that allows a locally authorized attacker with low privileges to gain SYSTEM privileges.
The version that knows your environment.
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.