{"id":"CVE-2026-85866","aliases":["EUVD-2026-100261","GHSA-p7vj-w2qw-6cfv"],"status":"published","title":"Windows ALPC Information Disclosure Vulnerability","description":"Exposure of sensitive system information to an unauthorized control sphere in Windows ALPC allows an authorized attacker to disclose information locally.","severity":{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.0035,"percentile":0.29047,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-497"],"published":"2026-10-13T19:01:21Z","modified":"2026-11-10T20:45:12Z","products":[{"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 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_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_2019"},{"vendor":"microsoft","product":"windows_server_2022"},{"vendor":"microsoft","product":"windows_server_2025"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85866","tags":["vendor-advisory","patch","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-85866"},{"url":"https://github.com/advisories/GHSA-p7vj-w2qw-6cfv"}],"sources":{"cve":[{"id":"CVE-2026-85866","title":"Windows ALPC Information Disclosure Vulnerability","description":"Exposure of sensitive system information to an unauthorized control sphere in Windows ALPC allows an authorized attacker to disclose information locally.","status":"published","published":"2026-10-13T19:01:21.597Z","modified":"2026-11-10T20:45:12.532Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna"}],"cwes":["CWE-497"],"updated_at":"2026-11-10T22:18:29.471829Z"}],"euvd":[{"id":"EUVD-2026-100261","description":"Exposure of sensitive system information to an unauthorized control sphere in Windows ALPC allows an authorized attacker to disclose information locally.","status":"published","published":"2026-10-13T19:01:21Z","modified":"2026-11-10T20:45:12Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-10T22:23:56.272923Z"}],"ghsa":[{"id":"GHSA-p7vj-w2qw-6cfv","title":"Exposure of sensitive system information to an unauthorized control sphere in Windows ALPC allows...","description":"Exposure of sensitive system information to an unauthorized control sphere in Windows ALPC allows an authorized attacker to disclose information locally.","status":"published","published":"2026-10-13T21:36:08Z","modified":"2026-10-13T21:36:09Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-497"],"updated_at":"2026-11-02T15:13:17.952607Z"}],"nvd":[{"id":"CVE-2026-85866","description":"Exposure of sensitive system information to an unauthorized control sphere in Windows ALPC allows an authorized attacker to disclose information locally.","status":"published","published":"2026-10-13T19:21:13.56Z","modified":"2026-10-29T15:53:02.467Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-497"],"updated_at":"2026-11-02T14:12:58.13117Z"}]}}