{"id":"CVE-2026-97788","aliases":["EUVD-2026-100308","GHSA-45q6-m2jc-mwfv"],"status":"published","title":"Active Directory Federation Services (AD FS) Information Disclosure Vulnerability","description":"Observable discrepancy in Active Directory Federation Services (AD FS) allows an unauthorized attacker to disclose information over a network.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00876,"percentile":0.59435,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-203"],"published":"2026-10-13T19:01:29Z","modified":"2026-11-10T20:45:41Z","products":[{"vendor":"microsoft","product":".net_framework"},{"vendor":"microsoft","product":"microsoft .net framework 3.5"},{"vendor":"microsoft","product":"microsoft .net framework 3.5 and 4.6.2/4.7/4.7.1/4.7.2"},{"vendor":"microsoft","product":"microsoft .net framework 3.5 and 4.7.2"},{"vendor":"microsoft","product":"microsoft .net framework 3.5 and 4.8"},{"vendor":"microsoft","product":"microsoft .net framework 3.5 and 4.8.1"},{"vendor":"microsoft","product":"microsoft .net framework 4.6.2/4.7/4.7.1/4.7.2"},{"vendor":"microsoft","product":"microsoft .net framework 4.8"},{"vendor":"microsoft","product":"microsoft .net framework 4.8.1"},{"vendor":"microsoft","product":"windows 10 version 1607"},{"vendor":"microsoft","product":"windows 10 version 1809"},{"vendor":"microsoft","product":"windows 10 version 21h2"},{"vendor":"microsoft","product":"windows 10 version 22h2"},{"vendor":"microsoft","product":"windows 11 version 23h2"},{"vendor":"microsoft","product":"windows 11 version 24h2"},{"vendor":"microsoft","product":"windows 11 version 25h2"},{"vendor":"microsoft","product":"windows 11 version 26h1"},{"vendor":"microsoft","product":"windows 11 version 26h2"},{"vendor":"microsoft","product":"windows server 2012"},{"vendor":"microsoft","product":"windows server 2012 (server core installation)"},{"vendor":"microsoft","product":"windows server 2012 r2"},{"vendor":"microsoft","product":"windows server 2012 r2 (server core installation)"},{"vendor":"microsoft","product":"windows server 2016"},{"vendor":"microsoft","product":"windows server 2016 (server core installation)"},{"vendor":"microsoft","product":"windows server 2019"},{"vendor":"microsoft","product":"windows server 2019 (server core installation)"},{"vendor":"microsoft","product":"windows server 2022"},{"vendor":"microsoft","product":"windows server 2025"},{"vendor":"microsoft","product":"windows server 2025 (server core installation)"},{"vendor":"microsoft","product":"windows_10_1607"},{"vendor":"microsoft","product":"windows_10_1809"},{"vendor":"microsoft","product":"windows_10_21h2"},{"vendor":"microsoft","product":"windows_10_22h2"},{"vendor":"microsoft","product":"windows_11_23h2"},{"vendor":"microsoft","product":"windows_11_24h2"},{"vendor":"microsoft","product":"windows_11_25h2"},{"vendor":"microsoft","product":"windows_11_26h1"},{"vendor":"microsoft","product":"windows_11_26h2"},{"vendor":"microsoft","product":"windows_server_2012"},{"vendor":"microsoft","product":"windows_server_2016"},{"vendor":"microsoft","product":"windows_server_2019"},{"vendor":"microsoft","product":"windows_server_2022"},{"vendor":"microsoft","product":"windows_server_2025"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97788","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97788"},{"url":"https://github.com/advisories/GHSA-45q6-m2jc-mwfv"}],"sources":{"cve":[{"id":"CVE-2026-97788","title":"Active Directory Federation Services (AD FS) Information Disclosure Vulnerability","description":"Observable discrepancy in Active Directory Federation Services (AD FS) allows an unauthorized attacker to disclose information over a network.","status":"published","published":"2026-10-13T19:01:29.503Z","modified":"2026-11-10T20:45:41.173Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-203"],"updated_at":"2026-11-10T22:18:30.298108Z"}],"euvd":[{"id":"EUVD-2026-100308","description":"Observable discrepancy in Active Directory Federation Services (AD FS) allows an unauthorized attacker to disclose information over a network.","status":"published","published":"2026-10-13T19:01:29Z","modified":"2026-11-10T20:45:41Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-10T22:23:55.776344Z"}],"ghsa":[{"id":"GHSA-45q6-m2jc-mwfv","title":"Observable discrepancy in Active Directory Federation Services (AD FS) allows an unauthorized...","description":"Observable discrepancy in Active Directory Federation Services (AD FS) allows an unauthorized attacker to disclose information over a network.","status":"published","published":"2026-10-13T21:37:14Z","modified":"2026-10-13T21:37:19Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-203"],"updated_at":"2026-11-02T15:13:20.228797Z"}],"nvd":[{"id":"CVE-2026-97788","description":"Observable discrepancy in Active Directory Federation Services (AD FS) allows an unauthorized attacker to disclose information over a network.","status":"published","published":"2026-10-13T19:22:16.697Z","modified":"2026-10-16T19:32:12.93Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-203"],"updated_at":"2026-11-02T14:12:58.630796Z"}]}}