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CVE record · CVE-2026-56155

Active Directory Federation Services Elevation of Privilege Vulnerability

CVSS 7.8 HighCriticalIn CISA KEVEPSS 0.0035 · 28th percentile

Critical, because:

  • In CISA’s KEV catalogue since 14 Jul 2026: it is known to be exploited.

How we decide what’s critical

Published by the CVE Program (CNA: microsoft) at 14 Jul 2026, 17:05 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Microsoft Windows 10 Version 1607
  • affected 10.0.14393.0 to before 10.0.14393.9339 custom
Microsoft Windows 10 Version 1809
  • affected 10.0.17763.0 to before 10.0.17763.9020 custom
Microsoft Windows Server 2012
  • affected 6.2.9200.0 to before 6.2.9200.26226 custom
Microsoft Windows Server 2012 (Server Core installation)
  • affected 6.2.9200.0 to before 6.2.9200.26226 custom
Microsoft Windows Server 2012 R2
  • affected 6.3.9600.0 to before 6.3.9600.23291 custom
Microsoft Windows Server 2012 R2 (Server Core installation)
  • affected 6.3.9600.0 to before 6.3.9600.23291 custom
Microsoft Windows Server 2016
  • affected 10.0.14393.0 to before 10.0.14393.9339 custom
Microsoft Windows Server 2016 (Server Core installation)
  • affected 10.0.14393.0 to before 10.0.14393.9339 custom
Microsoft Windows Server 2019
  • affected 10.0.17763.0 to before 10.0.17763.9020 custom
Microsoft Windows Server 2019 (Server Core installation)
  • affected 10.0.17763.0 to before 10.0.17763.9020 custom
Microsoft Windows Server 2022
  • affected 10.0.20348.0 to before 10.0.20348.5386 custom
Microsoft Windows Server 2025
  • affected 10.0.26100.0 to before 10.0.26100.33158 custom
Microsoft Windows Server 2025 (Server Core installation)
  • affected 10.0.26100.0 to before 10.0.26100.33158 custom
Identifiers
CVE-2026-56155
CNA
microsoft
Weakness (CWE)
CWE-1220
Tags
Published
14 Jul 2026
Updated
1 Nov 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.8 High 3.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C CNA (microsoft)
  • CISA KEV Listed since 14 Jul 2026: known to be exploited.
  • EPSS 0.0035, the 28th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 14 Jul 2026, 17:05 UTC Confirmed by the CVE List

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.