CVE-2026-56155

CVE Enrichment

CVSS: 7.8 HIGH
EPSS: 0.35%
EPSS Percentile: 26.23%
CISA KEV: YES — Known Exploited Vulnerability

Description

Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: secure@microsoft.com
Published: 15-Jul-2026 00:17
Last Modified: 15-Jul-2026 21:18
EPSS Date: 2026-10-12
CWE: CWE-1220

CVSS Vector


            CVSS:3.1                            AV:L /
                            AC:L /
                            PR:L /
                            UI:N /
                            S:U /
                            C:H /
                            I:H /
                            A:H

CISA KEV Details

Date Added: 2026-07-14
Remediation Due: 2026-07-28
Known Ransomware Campaign Use: Unknown
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.
Notes: https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-56155 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-56155; https://learn.microsoft.com/en-us/windows-server/identity/ad-fs/decommission/adfs-decommission-guide

Affected Products / Versions

microsoft / windows_10_1607
Version / affected range: * · before (exclusive) 10.0.14393.9339
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
microsoft / windows_10_1607
Version / affected range: * · before (exclusive) 10.0.14393.9339
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
microsoft / windows_10_1809
Version / affected range: * · before (exclusive) 10.0.17763.9020
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
microsoft / windows_10_1809
Version / affected range: * · before (exclusive) 10.0.17763.9020
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
microsoft / windows_server_2012
Version / affected range: -
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
microsoft / windows_server_2012
Version / affected range: r2
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
microsoft / windows_server_2016
Version / affected range: * · before (exclusive) 10.0.14393.9339
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
microsoft / windows_server_2019
Version / affected range: * · before (exclusive) 10.0.17763.9020
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
microsoft / windows_server_2022
Version / affected range: * · before (exclusive) 10.0.20348.5386
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
microsoft / windows_server_2025
Version / affected range: * · before (exclusive) 10.0.26100.33158
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

References

Last enrichment sync: 13-Oct-2026 03:51
Sources: NVD · FIRST EPSS · CISA KEV
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Reported Context (1)

CVE-2026-56155 Recorded Future Identifies 85 High-Impact Vulnerabilities in July, Many Actively Exploited

CVE (80)

Malware (4)

Threat Actors (8)

Vendors (25)

Products (70)

Tools (1)

Countries (1)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.