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CVE-2026-20871 is a local elevation-of-privilege vulnerability in Microsoft Windows Desktop Window Manager (DWM). The flaw is a use-after-free condition caused by insufficient validation that an object still exists before operations are performed on it. A local attacker with the ability to execute low-privileged code on the target system can trigger the stale object condition and exploit memory corruption in DWM to escalate privileges. Successful exploitation can result in arbitrary code execution in the context of SYSTEM.
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No valid public exploits. Mallory filtered out 2 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Windows Desktop Window Manager elevation of privilege vulnerability assessed as 'Exploitation More Likely' by Microsoft; no exploitation reported in the content.
An elevation-of-privilege vulnerability in Windows Desktop Window Manager (DWM) that Microsoft assessed as more likely to be exploited.
A local elevation of privilege vulnerability in Windows Desktop Window Manager (DWM) due to a use-after-free condition.
A Windows Desktop Window Manager (DWM) elevation-of-privilege (EoP) vulnerability that Microsoft rates as more likely to be exploited.
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.