{"cve":"CVE-2026-56155","nvd":{"published":"2026-07-14T17:17:09.763","modified":"2026-07-15T14:18:24.010","status":"Analyzed","description":"Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["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"],"products":["microsoft:windows_10_1607","microsoft:windows_10_1809","microsoft:windows_server_2012","microsoft:windows_server_2016","microsoft:windows_server_2019","microsoft:windows_server_2022","microsoft:windows_server_2025"],"source":"nvd","synced_at":"2026-10-19T22:44:02.134301115+00:00"},"epss":{"cve":"CVE-2026-56155","score":0.00346,"percentile":0.2823,"date":"2026-10-31"},"kev":{"cve":"CVE-2026-56155","date_added":"2026-07-14","due_date":"2026-07-28","vendor":"Microsoft","product":"Active Directory Federation Services","known_ransomware":false},"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}