CVE-2026-83646

medium

EUVD alias: EUVD-2026-99311

Assigned by CNA: microsoft

Published 2026-10-13 · Modified 2026-10-13

Discuss on Community Propose mitigation

CVSS v3

4.8

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C

CVSS v4 NEW

—

not yet in upstream

VIR risk

4.8

Description

Url redirection to untrusted site ('open redirect') in Active Directory Federation Services (AD FS) allows an authorized attacker to perform spoofing over a network.

Predictions

Exploit likelihood

58%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

Propose a mitigation on Community Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

Windows Affected 1 release

Version	Package	Status	Fixed in
—	—	Affected	—

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83646

CWEs

CWE-601

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.