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CVE-2026-42989 is a local elevation of privilege vulnerability in Winlogon caused by improper link resolution before file access, commonly referred to as link following. The flaw allows Winlogon to operate on a file target resolved through a link in an unsafe manner, enabling a locally authorized attacker to influence privileged file access behavior. On a successful exploit path, the attacker can abuse Winlogon’s elevated context to perform actions on attacker-controlled or attacker-selected file targets and thereby escalate privileges on the local system.
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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.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Winlogon elevation-of-privilege vulnerability assessed as more likely to be exploited within 30 days.
An elevation of privilege vulnerability in Winlogon.
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.