Windows Update stack link-following flaw gives SYSTEM rights

high severity · exploited in the wild · published 2026-09-08

A link-following flaw in the Windows Update stack lets a local attacker raise their privileges all the way to SYSTEM. It is already being exploited in the wild.

Fixed in: 10.0.28000.2954

CVE: CVE-2026-81963

Source: Microsoft (MSRC)

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