CVE-2026-85329: Microsoft Account race condition in concurrent execution

CVE-2026-85329 · Severity: high · CVSS 7 · Published 2026-10-13

Microsoft Account contains a race condition in its handling of shared resources, allowing an authorized attacker to escalate their privileges locally. An attacker with valid credentials could exploit timing windows to bypass privilege restrictions and gain elevated access to the system.

Technologies: Microsoft Account, Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows 11 26h1, Microsoft Windows 11 26h2, Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2025. Vendors: Microsoft.

Quick answers

Is CVE-2026-85329 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-85329 being exploited in the wild.
How severe is CVE-2026-85329?
High severity, with a CVSS score of 7, published 13 October 2026.
Which products and versions are affected?
Microsoft Account.
Is there a fix for CVE-2026-85329?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-85329 attacked?
It is attacked with local access, in a hosted service.
Am I affected by CVE-2026-85329?
Check whether you run Microsoft Account, Microsoft Windows 10 1607, Microsoft Windows 10 1809 or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A race condition exists in Microsoft Account's synchronization of shared resources during concurrent execution. An authorized local attacker can exploit a timing window to elevate privileges. The vulnerability requires prior authentication and local access but does not require user interaction.

Affected products

  • Microsoft Account

Timeline

  • 2026-10-13: disclosed

References

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