CVE-2026-56155

Description

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

Scoring

• CVSS: 7.8 (HIGH, 3.1)
• EPSS exploitation probability: Not yet available
• EPSS percentile: Not yet available

CISA KEV status

• Added to KEV: 2026-07-14
• Remediation due date: 2026-07-28
• Known ransomware campaign use: Unknown

Weakness types (CWE)

• CWE-1220

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56155
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56155

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