{"id":"CVE-2026-97801","aliases":[],"title":".NET Framework Tampering Vulnerability","titleSource":"microsoft","descriptionSource":"microsoft","products":[{"vendor":"Microsoft","name":"Microsoft .NET Framework 3.5","platforms":["Windows 11 version 26H1","Windows Server 2012","Windows Server 2012 R2"],"versions":[{"version":"3.5.0","status":"affected","lessThan":"2.0.50727.9188 AND 3.0.30729.9171","versionType":"custom"}],"source":"microsoft","url":"https://www.cve.org/CVERecord?id=CVE-2026-97801"},{"vendor":"Microsoft","name":"Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2","platforms":["Windows 10 version 1607","Windows Server 2016","Windows Server 2019"],"versions":[{"version":"3.0.0.0","status":"affected","lessThan":"2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0","versionType":"custom"}],"source":"microsoft","url":"https://www.cve.org/CVERecord?id=CVE-2026-97801"},{"vendor":"Microsoft","name":"Microsoft .NET Framework 3.5 AND 4.7.2","platforms":["Windows 10 version 1809"],"versions":[{"version":"4.7.0","status":"affected","lessThan":"2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0","versionType":"custom"}],"source":"microsoft","url":"https://www.cve.org/CVERecord?id=CVE-2026-97801"},{"vendor":"Microsoft","name":"Microsoft .NET Framework 3.5 AND 4.8","platforms":["Windows 10 version 1809","Windows 10 version 21H2","Windows 10 version 22H2","Windows Server 2019","Windows Server 2022"],"versions":[{"version":"4.8.0","status":"affected","lessThan":"2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0","versionType":"custom"}],"source":"microsoft","url":"https://www.cve.org/CVERecord?id=CVE-2026-97801"},{"vendor":"Microsoft","name":"Microsoft .NET Framework 3.5 AND 4.8.1","platforms":["Windows 10 version 21H2","Windows 10 version 22H2","Windows 11 version 23H2","Windows 11 version 24H2","Windows 11 version 25H2","Windows 11 version 26H2","Windows Server 2022","Windows Server 2025"],"versions":[{"version":"4.8.1","status":"affected","lessThan":"2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0","versionType":"custom"}],"source":"microsoft","url":"https://www.cve.org/CVERecord?id=CVE-2026-97801"},{"vendor":"Microsoft","name":"Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2","platforms":["Windows Server 2012","Windows Server 2012 R2"],"versions":[{"version":"4.7.0","status":"affected","lessThan":"4.7.4150.0","versionType":"custom"}],"source":"microsoft","url":"https://www.cve.org/CVERecord?id=CVE-2026-97801"},{"vendor":"Microsoft","name":"Microsoft .NET Framework 4.8","platforms":["Windows 10 version 1607","Windows Server 2012","Windows Server 2012 R2","Windows Server 2016"],"versions":[{"version":"4.8.0","status":"affected","lessThan":"4.8.4811.0","versionType":"custom"}],"source":"microsoft","url":"https://www.cve.org/CVERecord?id=CVE-2026-97801"},{"vendor":"Microsoft","name":"Microsoft .NET Framework 4.8.1","platforms":["Windows 11 version 26H1"],"versions":[{"version":"4.8.0.0","status":"affected","lessThan":"4.8.9363.0","versionType":"custom"}],"source":"microsoft","url":"https://www.cve.org/CVERecord?id=CVE-2026-97801"}],"remediation":[],"description":"Improper validation of specified type of input in .NET Framework allows an unauthorized attacker to perform tampering over a network.","severity":"high","score":7.5,"published":"2026-10-13T19:01:45.603Z","modified":"2026-10-28T18:22:32.705Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97801"],"sources":[{"name":"CVE","id":"CVE-2026-97801","modified":"2026-10-28T18:22:32.705Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-97801"}],"assessments":[{"source":"microsoft","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C","score":7.5}],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-29T00:30:33.731Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-10-28T19:15:32.805Z","attemptedAt":"2026-10-28T19:15:32.805Z"},{"source":"GHSA","status":"available","checkedAt":"2026-10-28T19:15:33.433Z","attemptedAt":"2026-10-28T19:15:33.433Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-28T19:15:32.742Z","attemptedAt":"2026-10-28T19:15:32.742Z"},{"source":"EPSS","status":"available","checkedAt":"2026-10-28T19:15:32.760Z","attemptedAt":"2026-10-28T19:15:32.760Z"}],"evidence":[{"source":"ENISA EUVD","id":"EUVD-2026-100458","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-100458","modified":"Oct 28, 2026, 6:22:32 PM","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C","checkedAt":"2026-10-28T19:15:32.742Z"},{"source":"FIRST EPSS","id":"CVE-2026-97801","url":"https://www.first.org/epss/","probability":0.00734,"percentile":0.54253,"date":"2026-10-28","checkedAt":"2026-10-28T19:15:32.760Z"},{"source":"NVD","id":"CVE-2026-97801","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97801","modified":"2026-10-13T23:19:33.740","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","checkedAt":"2026-10-28T19:15:32.805Z"},{"source":"GitHub Advisory Database","id":"GHSA-pjfw-qhmc-7gc7","url":"https://github.com/advisories/GHSA-pjfw-qhmc-7gc7","modified":"2026-10-13T21:37:16Z","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","checkedAt":"2026-10-28T19:15:33.433Z"}]}