{"id":"CVE-2026-83856","aliases":["EUVD-2026-100015","GHSA-fw5f-5j4p-c43m"],"status":"published","title":"Windows Event Logging Service Remote Code Execution Vulnerability","description":"Out-of-bounds read in Windows Event Logging Service allows an unauthorized attacker to execute code over a network.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/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":0.00631,"percentile":0.5071,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-125"],"published":"2026-10-13T19:00:58Z","modified":"2026-11-10T20:42:47Z","products":[{"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 2022"},{"vendor":"microsoft","product":"windows server 2025"},{"vendor":"microsoft","product":"windows server 2025 (server core installation)"},{"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_2022"},{"vendor":"microsoft","product":"windows_server_2025"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83856","tags":["vendor-advisory","patch","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-83856"},{"url":"https://github.com/advisories/GHSA-fw5f-5j4p-c43m"}],"sources":{"cve":[{"id":"CVE-2026-83856","title":"Windows Event Logging Service Remote Code Execution Vulnerability","description":"Out-of-bounds read in Windows Event Logging Service allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-10-13T19:00:58.141Z","modified":"2026-11-10T20:42:47.214Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-125"],"updated_at":"2026-11-10T22:18:28.707469Z"}],"euvd":[{"id":"EUVD-2026-100015","description":"Out-of-bounds read in Windows Event Logging Service allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-10-13T19:00:58Z","modified":"2026-11-10T20:42:47Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-10T22:23:57.623557Z"}],"ghsa":[{"id":"GHSA-fw5f-5j4p-c43m","title":"Out-of-bounds read in Windows Event Logging Service allows an unauthorized attacker to execute...","description":"Out-of-bounds read in Windows Event Logging Service allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-10-13T21:34:59Z","modified":"2026-10-13T21:35:01Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T15:13:16.842321Z"}],"nvd":[{"id":"CVE-2026-83856","description":"Out-of-bounds read in Windows Event Logging Service allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-10-13T19:20:34.643Z","modified":"2026-10-21T15:38:53.34Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T14:12:58.13117Z"}]}}