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CVE-2026-70005

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

Weak authentication in Active Directory Federation Services (AD FS) allows an unauthorized attacker to bypass a security feature over a network.

Fix

Microsoft's update · Important

  • KB5126651 — Windows Server 2019, Windows Server 2019 (Server Core installation) · 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+3 CPE criteria (now 3)NVD modified 2026-10-28 16:43
  2. StatusPublished → AnalyzedNVD modified 2026-10-28 16:43
  3. StatusAwaiting Analysis → PublishedNVD modified 2026-10-19 19:35
  4. First seenCVSS 5.9NVD modified 2026-10-14 19:17

Affected (CPE criteria) 3

  • 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