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CVE-2026-103576

6.5 medium SSVC exploitation: none Analyzed
NVD · CVE.org

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

Fix

Microsoft's update · Important

  • KB5126868 — Windows Server 2016, Windows Server 2016 (Server Core installation), Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 · build 10.0.14393.9612 · restart required
  • KB5126651 — Windows Server 2019, Windows Server 2019 (Server Core installation), Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 · build 10.0.17763.9376 · restart required
  • KB5126655 — Windows Server 2022, Windows Server 2022 (Server Core installation) · build 10.0.20348.5761 · restart required
  • KB5126646 — Windows Server 2025, Windows Server 2025 (Server Core installation) · build 10.0.26100.33650 · restart required

From the 2026-Oct release note of Microsoft's Security Update Guide, revised 2026-10-29 · Exploitation Less Likely.

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 4

  1. Cpes+8 CPE criteria (now 8)NVD modified 2026-10-27 17:31
  2. StatusPublished → AnalyzedNVD modified 2026-10-27 17:31
  3. StatusAwaiting Analysis → PublishedNVD modified 2026-10-19 19:42
  4. First seenCVSS 6.5NVD modified 2026-10-13 23:17

Affected (CPE criteria) 8

  • cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
  • cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
  • cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
  • cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
  • cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:x64:*
  • cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:x64:*
  • cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:x64:*
  • cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*

References 1