{"id":"CVE-2026-20931","aliases":["EUVD-2026-2123","GHSA-qvh8-5v9x-29hh"],"status":"published","title":"Windows Telephony Service Elevation of Privilege Vulnerability","description":"External control of file name or path in Windows Telephony Service allows an authorized attacker to elevate privileges over an adjacent network.","severity":{"version":"3.1","score":8,"vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00845,"percentile":0.58428,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-73"],"published":"2026-01-13T17:57:03Z","modified":"2026-07-30T21:17:09Z","products":[{"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 server 2008 r2 service pack 1"},{"vendor":"microsoft","product":"windows server 2008 r2 service pack 1 (server core installation)"},{"vendor":"microsoft","product":"windows server 2008 service pack 2"},{"vendor":"microsoft","product":"windows server 2008 service pack 2 (server core installation)"},{"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 2022, 23h2 edition (server core installation)"},{"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_server_2008"},{"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_2022_23h2"},{"vendor":"microsoft","product":"windows_server_2025"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20931","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://www.vicarius.io/vsociety/posts/cve-2026-20931-detection-script-elevation-of-privilege-vulnerability-in-windows-telephony-service"},{"url":"https://www.vicarius.io/vsociety/posts/cve-2026-20931-mitigation-script-elevation-of-privilege-vulnerability-in-windows-telephony-service"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20931"},{"url":"https://github.com/advisories/GHSA-qvh8-5v9x-29hh"}],"sources":{"cve":[{"id":"CVE-2026-20931","title":"Windows Telephony Service Elevation of Privilege Vulnerability","description":"External control of file name or path in Windows Telephony Service allows an authorized attacker to elevate privileges over an adjacent 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authorized attacker to elevate privileges over an adjacent network.","status":"published","published":"2026-01-13T18:31:10Z","modified":"2026-05-26T18:31:36Z","cvss":[{"version":"3.1","score":8,"vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-73"],"updated_at":"2026-11-02T15:08:18.132911Z"}],"nvd":[{"id":"CVE-2026-20931","description":"External control of file name or path in Windows Telephony Service allows an authorized attacker to elevate privileges over an adjacent network.","status":"published","published":"2026-01-13T18:16:20.003Z","modified":"2026-07-30T21:17:09.91Z","cvss":[{"version":"3.1","score":8,"vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-73"],"updated_at":"2026-11-02T14:12:04.066712Z"}]}}