{"id":"CVE-2025-53478","aliases":["EUVD-2025-20294","GHSA-r979-wmj9-cr9m"],"status":"published","title":"CheckUser: Reflected Cross-Site Scripting (XSS) in Special:Investigate via unsanitized i18n messages","description":"The CheckUser extension’s Special:Investigate interface is vulnerable to reflected XSS due to improper escaping of certain internationalized system messages rendered on the “IPs and User agents” tab.\n\n\n\n\nThis issue affects Mediawiki - CheckUser extension: from 1.39.X before 1.39.13, from 1.42.X before 1.42.7, from 1.43.X before 1.43.2.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-10","score":0.00203,"percentile":0.10354,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2025-07-07T18:16:33Z","modified":"2026-06-17T09:38:16Z","products":[{"vendor":"the wikimedia foundation","product":"mediawiki - checkuser extension"},{"vendor":"wikimedia foundation","product":"mediawiki - checkuser extension"}],"references":[{"url":"https://phabricator.wikimedia.org/T394692"},{"url":"https://gerrit.wikimedia.org/r/q/I3a1e21b6800ff4d813a33ee9fe9b7ccf070b6b2e"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-53478"},{"url":"https://github.com/advisories/GHSA-r979-wmj9-cr9m"}],"sources":{"cve":[{"id":"CVE-2025-53478","title":"CheckUser: Reflected Cross-Site Scripting (XSS) in Special:Investigate via unsanitized i18n messages","description":"The CheckUser extension’s Special:Investigate interface is vulnerable to reflected XSS due to improper escaping of certain internationalized system messages rendered on the “IPs and User agents” tab.\n\n\n\n\nThis issue affects Mediawiki - CheckUser extension: from 1.39.X before 1.39.13, from 1.42.X before 1.42.7, from 1.43.X before 1.43.2.","status":"published","published":"2025-07-07T18:16:33.919Z","modified":"2025-07-07T20:49:34.393Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"adp"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:32:49.180768Z"}],"euvd":[{"id":"EUVD-2025-20294","description":"The CheckUser extension’s Special:Investigate interface is vulnerable to reflected XSS due to improper escaping of certain internationalized system messages rendered on the “IPs and User agents” tab.\n\n\n\n\nThis issue affects Mediawiki - CheckUser extension: from 1.39.X before 1.39.13, from 1.42.X before 1.42.7, from 1.43.X before 1.43.2.","status":"published","published":"2025-07-07T18:16:33Z","modified":"2025-07-07T20:49:34Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T20:32:13.001759Z"}],"ghsa":[{"id":"GHSA-r979-wmj9-cr9m","title":"The CheckUser extension’s Special:Investigate interface is vulnerable to reflected XSS due to...","description":"The CheckUser extension’s Special:Investigate interface is vulnerable to reflected XSS due to improper escaping of certain internationalized system messages rendered on the “IPs and User agents” tab.\n\n\n\n\nThis issue affects Mediawiki - CheckUser extension: from 1.39.X before 1.39.13, from 1.42.X before 1.42.7, from 1.43.X before 1.43.2.","status":"published","published":"2025-07-07T21:31:21Z","modified":"2025-07-07T21:31:22Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:02:55.508924Z"}],"nvd":[{"id":"CVE-2025-53478","description":"The CheckUser extension’s Special:Investigate interface is vulnerable to reflected XSS due to improper escaping of certain internationalized system messages rendered on the “IPs and User agents” tab.\n\n\n\n\nThis issue affects Mediawiki - CheckUser extension: from 1.39.X before 1.39.13, from 1.42.X before 1.42.7, from 1.43.X before 1.43.2.","status":"published","published":"2025-07-07T19:15:23.29Z","modified":"2026-06-17T09:38:16.917Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:11:16.997062Z"}]}}