{"id":"CVE-2026-97788","title":"Observable discrepancy in Active Directory Federation Services (AD FS) allows an unauthorized attacker to disclose information over a network.","summary":"Observable discrepancy in Active Directory Federation Services (AD FS) allows an unauthorized attacker to disclose information over a network.","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-203"],"vendor":"microsoft","product":".net_framework","affected":["windows_10_1607 < 10.0.14393.9612","windows_10_1809 < 10.0.17763.9376","windows_10_21h2 < 10.0.19044.7807","windows_10_22h2 < 10.0.19045.7807","windows_11_23h2 < 10.0.22631.7652","windows_11_24h2 < 10.0.26100.9711","windows_11_25h2 < 10.0.26200.9711","windows_11_26h1 < 10.0.28000.3231","windows_11_26h2 < 10.0.26300.9711","windows_server_2012","windows_server_2012 = r2","windows_server_2016 < 10.0.14393.9612","windows_server_2019 < 10.0.17763.9376","windows_server_2022 < 10.0.20348.5761","windows_server_2025 < 10.0.26100.33650",".net_framework = 4.8.1",".net_framework = 4.8",".net_framework = 4.6.2",".net_framework = 4.7",".net_framework = 4.7.1",".net_framework = 4.7.2",".net_framework = 3.5"],"patched":["windows_10_1607 10.0.14393.9612","windows_10_1809 10.0.17763.9376","windows_10_21h2 10.0.19044.7807","windows_10_22h2 10.0.19045.7807","windows_11_23h2 10.0.22631.7652","windows_11_24h2 10.0.26100.9711","windows_11_25h2 10.0.26200.9711","windows_11_26h1 10.0.28000.3231","windows_11_26h2 10.0.26300.9711","windows_server_2016 10.0.14393.9612","windows_server_2019 10.0.17763.9376","windows_server_2022 10.0.20348.5761","windows_server_2025 10.0.26100.33650"],"published":"2026-10-13","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:32:12.930","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-97788","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97788","label":"secure@microsoft.com"}],"tags":["nvd","cve.org"],"epss":0.00876,"epssPercentile":0.58816,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-13T19:31:42.754445Z"},"ingestedAt":"2026-10-13T19:43:29.305Z","slug":"CVE-2026-97788","body":"## Overview\n\nObservable discrepancy in Active Directory Federation Services (AD FS) allows an unauthorized attacker to disclose information over a network.\n\n## Affected\n\n- `windows_10_1607 < 10.0.14393.9612`\n- `windows_10_1809 < 10.0.17763.9376`\n- `windows_10_21h2 < 10.0.19044.7807`\n- `windows_10_22h2 < 10.0.19045.7807`\n- `windows_11_23h2 < 10.0.22631.7652`\n- `windows_11_24h2 < 10.0.26100.9711`\n- `windows_11_25h2 < 10.0.26200.9711`\n- `windows_11_26h1 < 10.0.28000.3231`\n- `windows_11_26h2 < 10.0.26300.9711`\n- `windows_server_2012`\n- `windows_server_2012 = r2`\n- `windows_server_2016 < 10.0.14393.9612`\n- `windows_server_2019 < 10.0.17763.9376`\n- `windows_server_2022 < 10.0.20348.5761`\n- `windows_server_2025 < 10.0.26100.33650`\n- `.net_framework = 4.8.1`\n- `.net_framework = 4.8`\n- `.net_framework = 4.6.2`\n- `.net_framework = 4.7`\n- `.net_framework = 4.7.1`\n- `.net_framework = 4.7.2`\n- `.net_framework = 3.5`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `windows_10_1607 10.0.14393.9612`\n- `windows_10_1809 10.0.17763.9376`\n- `windows_10_21h2 10.0.19044.7807`\n- `windows_10_22h2 10.0.19045.7807`\n- `windows_11_23h2 10.0.22631.7652`\n- `windows_11_24h2 10.0.26100.9711`\n- `windows_11_25h2 10.0.26200.9711`\n- `windows_11_26h1 10.0.28000.3231`\n- `windows_11_26h2 10.0.26300.9711`\n- `windows_server_2016 10.0.14393.9612`\n- `windows_server_2019 10.0.17763.9376`\n- `windows_server_2022 10.0.20348.5761`\n- `windows_server_2025 10.0.26100.33650`","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}