Live › vulnerability › CVE-2026-56155
Go to dashboardMicrosoft Active Directory Federation Services has an access control flaw that lets an authorized local user elevate their privileges. CISA lists it as actively exploited in the wild.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 5h before NVD. All times on this page are UTC.
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Microsoft Active Directory Federation Services | vendor | – | – |
| microsoft windows 10 1607 | vendor | < 10.0.14393.9339 | 10.0.14393.9339 |
| microsoft windows 10 1809 | vendor | < 10.0.17763.9020 | 10.0.17763.9020 |
| microsoft windows server 2012 | vendor | – |
| – |
| microsoft windows server 2012 | vendor | = r2 | – |
| microsoft windows server 2016 | vendor | < 10.0.14393.9339 | 10.0.14393.9339 |
| microsoft windows server 2019 | vendor | < 10.0.17763.9020 | 10.0.17763.9020 |
| microsoft windows server 2022 | vendor | < 10.0.20348.5386 | 10.0.20348.5386 |
| microsoft windows server 2025 | vendor | < 10.0.26100.33158 | 10.0.26100.33158 |
Unknown from the sources.
Apply the mitigations and patches from Microsoft's advisory for CVE-2026-56155, following CISA BOD 26-04 guidance; discontinue use of the product if mitigations are unavailable.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Microsoft Active Directory Federation Services contains an insufficient granularity of access control vulnerability that allows an authorized attacker to elevate privileges locally.
CISA required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
This page as .md · .json · in your agent: get_signal("CVE-2026-56155")
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