{"id":"CVE-2023-37303","aliases":["BIT-mediawiki-2023-37303","EUVD-2023-41207","GHSA-frhg-fmpg-fqp2","UBUNTU-CVE-2023-37303"],"status":"published","title":"An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. In certain...","description":"An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. In certain situations, an attempt to block a user fails after a temporary browser hang and a DBQueryDisconnectedError error message.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.00953,"percentile":0.61774,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-754"],"published":"2023-06-30T00:00:00Z","modified":"2026-10-28T02:30:52Z","fixes":[{"ecosystem":"Bitnami","package":"mediawiki","fixed_in":["1.39.4"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"mediawiki","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.39.4"}]}]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.27.3-1","1:1.27.4-1","1:1.27.4-2","1:1.27.4-3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.31.2-1ubuntu1","1:1.31.5-1","1:1.31.5-1ubuntu1","1:1.31.5-2","1:1.31.5-3","1:1.31.5-3ubuntu1","1:1.31.6-1","1:1.31.7-1","1:1.31.7-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.35.3-1","1:1.35.4-1","1:1.35.5-1","1:1.35.5-1ubuntu1","1:1.35.5-1ubuntu2","1:1.35.5-1ubuntu3","1:1.35.6-1","1:1.35.6-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.39.4-2","1:1.39.5-1","1:1.39.6-1","1:1.39.7-1","1:1.39.7-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.43.1+dfsg-1","1:1.43.1+dfsg-2","1:1.43.3+dfsg-1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.43.8+dfsg-2","1:1.43.9+dfsg-1","1:1.43.9+dfsg-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.43.3+dfsg-1","1:1.43.5+dfsg-1","1:1.43.6+dfsg-2","1:1.43.8+dfsg-1","1:1.43.8+dfsg-2"]}],"products":[{"vendor":"mediawiki","product":"mediawiki"}],"references":[{"url":"https://phabricator.wikimedia.org/T338276","tags":["x_transferred","Exploit","Issue Tracking","Patch","Vendor Advisory","web","report"]},{"url":"https://gerrit.wikimedia.org/r/q/I10a9273c542576b3f7bb38de68dcd2aa41cfb1b0","tags":["x_transferred","Vendor Advisory","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-37303","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-frhg-fmpg-fqp2"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/37xxx/CVE-2023-37303.json","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2023-37303","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-37303","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2023-37303","description":"An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. In certain situations, an attempt to block a user fails after a temporary browser hang and a DBQueryDisconnectedError error message.","status":"published","published":"2023-06-30T00:00:00Z","modified":"2024-11-27T18:41:36.313Z","cwes":["CWE-754"],"updated_at":"2026-11-02T14:35:16.454633Z"}],"euvd":[{"id":"EUVD-2023-41207","description":"An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. In certain situations, an attempt to block a user fails after a temporary browser hang and a DBQueryDisconnectedError error message.","status":"published","published":"2023-06-30T00:00:00Z","modified":"2024-11-27T18:41:36Z","updated_at":"2026-11-03T00:04:45.257697Z"}],"ghsa":[{"id":"GHSA-frhg-fmpg-fqp2","title":"An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. In certain...","description":"An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. In certain situations, an attempt to block a user fails after a temporary browser hang and a DBQueryDisconnectedError error message.","status":"published","published":"2023-06-30T18:31:02Z","modified":"2024-11-27T21:32:43Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-754"],"updated_at":"2026-11-02T14:58:59.313142Z"}],"nvd":[{"id":"CVE-2023-37303","description":"An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. In certain situations, an attempt to block a user fails after a temporary browser hang and a DBQueryDisconnectedError error message.","status":"published","published":"2023-06-30T17:15:09.617Z","modified":"2026-06-17T06:07:55.68Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"}],"cwes":["CWE-754"],"updated_at":"2026-11-02T14:08:14.715708Z"}],"osv":[{"id":"UBUNTU-CVE-2023-37303","description":"An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. In certain situations, an attempt to block a user fails after a temporary browser hang and a DBQueryDisconnectedError error message.","status":"published","published":"2023-06-30T17:15:00Z","modified":"2026-10-17T12:56:24.204853106Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T16:54:21.882004Z"},{"id":"BIT-mediawiki-2023-37303","description":"An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. In certain situations, an attempt to block a user fails after a temporary browser hang and a DBQueryDisconnectedError error message.","status":"published","published":"2024-03-06T10:59:46.503Z","modified":"2025-04-03T14:40:37.652Z","updated_at":"2026-11-02T15:28:33.072289Z"},{"id":"CVE-2023-37303","description":"An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. In certain situations, an attempt to block a user fails after a temporary browser hang and a DBQueryDisconnectedError error message.","status":"published","published":"2023-06-30T00:00:00Z","modified":"2026-10-28T02:30:52.124270327Z","updated_at":"2026-11-02T15:44:32.510144Z"}]}}