CVE-2026-119921 · Infrastructure
NO FIX YET
A heap-based buffer overflow in the Windows Microsoft Account Sign-in Assistant service lets a signed-in attacker raise their privileges on the same machine. The sources give a CVSS score of 7.0 and no details of the affected Windows versions or fix.
first public Nov 10, 2026 · 1 source
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Windows machines with the Microsoft Account Sign-in Assistant service present. The sources do not list affected Windows builds or whether the service is disabled by default. An attacker needs an existing local account on the machine.
Not affected if no-local-user-access
Who cares microsoft-account, windows
Unknown from the sources. In the analyst’s queue.
No fix yet, per the sources.
Heap-based buffer overflow in Windows Microsoft Account Sign-in Assistant allows an authorized attacker to elevate privileges locally.
This page as .md · .json · CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
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