{"id":"CVE-2023-45367","aliases":["BIT-mediawiki-2023-45367","EUVD-2023-49659","GHSA-86q3-j68g-7jjc"],"status":"published","title":"An issue was discovered in the CheckUser extension for MediaWiki before 1.35.12, 1.36.x through 1...","description":"An issue was discovered in the CheckUser extension for MediaWiki before 1.35.12, 1.36.x through 1.39.x before 1.39.5, and 1.40.x before 1.40.1. A user can use a rest.php/checkuser/v0/useragent-clienthints/revision/ URL to store an arbitrary number of rows in cu_useragent_clienthints, leading to a denial of service.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.00655,"percentile":0.51656,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2023-10-09T00:00:00Z","modified":"2026-10-28T02:30:49Z","fixes":[{"ecosystem":"Bitnami","package":"mediawiki","fixed_in":["1.35.12","1.39.5","1.40.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"mediawiki","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.35.12"},{"introduced":"1.36.0"},{"fixed":"1.39.5"},{"introduced":"1.40.0"},{"fixed":"1.40.1"}]}]}],"products":[{"vendor":"mediawiki","product":"mediawiki"}],"references":[{"url":"https://phabricator.wikimedia.org/T344923","tags":["x_transferred","Exploit","Issue Tracking","Vendor Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-45367","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-86q3-j68g-7jjc"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/45xxx/CVE-2023-45367.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2023-45367","description":"An issue was discovered in the CheckUser extension for MediaWiki before 1.35.12, 1.36.x through 1.39.x before 1.39.5, and 1.40.x before 1.40.1. A user can use a rest.php/checkuser/v0/useragent-clienthints/revision/ URL to store an arbitrary number of rows in cu_useragent_clienthints, leading to a denial of service.","status":"published","published":"2023-10-09T00:00:00Z","modified":"2024-09-19T18:04:49.06Z","updated_at":"2026-11-02T14:35:22.984825Z"}],"euvd":[{"id":"EUVD-2023-49659","description":"An issue was discovered in the CheckUser extension for MediaWiki before 1.35.12, 1.36.x through 1.39.x before 1.39.5, and 1.40.x before 1.40.1. A user can use a rest.php/checkuser/v0/useragent-clienthints/revision/ URL to store an arbitrary number of rows in cu_useragent_clienthints, leading to a denial of service.","status":"published","published":"2023-10-09T00:00:00Z","modified":"2024-09-19T18:04:49Z","updated_at":"2026-11-03T00:28:18.665654Z"}],"ghsa":[{"id":"GHSA-86q3-j68g-7jjc","title":"An issue was discovered in the CheckUser extension for MediaWiki before 1.35.12, 1.36.x through 1...","description":"An issue was discovered in the CheckUser extension for MediaWiki before 1.35.12, 1.36.x through 1.39.x before 1.39.5, and 1.40.x before 1.40.1. A user can use a rest.php/checkuser/v0/useragent-clienthints/revision/ URL to store an arbitrary number of rows in cu_useragent_clienthints, leading to a denial of service.","status":"published","published":"2023-10-09T06:30:18Z","modified":"2024-04-04T08:25:30Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T14:56:58.07957Z"}],"nvd":[{"id":"CVE-2023-45367","description":"An issue was discovered in the CheckUser extension for MediaWiki before 1.35.12, 1.36.x through 1.39.x before 1.39.5, and 1.40.x before 1.40.1. A user can use a rest.php/checkuser/v0/useragent-clienthints/revision/ URL to store an arbitrary number of rows in cu_useragent_clienthints, leading to a denial of service.","status":"published","published":"2023-10-09T05:15:09.357Z","modified":"2026-06-17T06:28:42.323Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:08:36.656095Z"}],"osv":[{"id":"BIT-mediawiki-2023-45367","description":"An issue was discovered in the CheckUser extension for MediaWiki before 1.35.12, 1.36.x through 1.39.x before 1.39.5, and 1.40.x before 1.40.1. A user can use a rest.php/checkuser/v0/useragent-clienthints/revision/ URL to store an arbitrary number of rows in cu_useragent_clienthints, leading to a denial of service.","status":"published","published":"2024-03-06T10:58:28.391Z","modified":"2025-04-03T14:40:37.652Z","updated_at":"2026-11-02T15:28:33.072289Z"},{"id":"CVE-2023-45367","description":"An issue was discovered in the CheckUser extension for MediaWiki before 1.35.12, 1.36.x through 1.39.x before 1.39.5, and 1.40.x before 1.40.1. A user can use a rest.php/checkuser/v0/useragent-clienthints/revision/ URL to store an arbitrary number of rows in cu_useragent_clienthints, leading to a denial of service.","status":"published","published":"2023-10-09T00:00:00Z","modified":"2026-10-28T02:30:49.397786972Z","updated_at":"2026-11-02T15:44:34.287121Z"}]}}