{"id":"CVE-2025-53479","state":"PUBLISHED","title":"CheckUser: Reflected Cross-Site Scripting (XSS) in Special:CheckUser via unsanitized internationalized message","description":"The CheckUser extension’s Special:CheckUser interface is vulnerable to reflected XSS via the rev-deleted-user message. This message is rendered without proper escaping, making it possible to inject JavaScript through the uselang=x-xss language override mechanism.\n\n\n\n\nThis issue affects Mediawiki - CheckUser extension: from 1.42.X before 1.42.7, from 1.43.X before 1.43.2.","publishedAt":"2025-07-08T17:16:36.081Z","updatedAt":"2025-07-10T13:18:39.505Z","severity":{"score":5.4,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","source":"CISA-ADP"},"assigner":"wikimedia-foundation","products":["Wikimedia Foundation Mediawiki - CheckUser extension"],"affected":[{"vendor":"Wikimedia Foundation","product":"Mediawiki - CheckUser extension","defaultStatus":"unaffected","versions":[{"version":"1.42.x","status":"affected","lessThan":"1.42.7","versionType":"semver"},{"version":"1.43.x","status":"affected","lessThan":"1.43.2","versionType":"semver"}]}],"references":["https://phabricator.wikimedia.org/T394693","https://gerrit.wikimedia.org/r/q/I159e14543912cb3bc7f4a00c3090c0285b154786"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:09:31.862Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/53xxx/CVE-2025-53479.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2025-53479","state":"PUBLISHED","datePublished":"2025-07-08T17:16:36.081Z","dateUpdated":"2025-07-10T13:18:39.505Z","assignerShortName":"wikimedia-foundation","assignerOrgId":"c4f26cc8-17ff-4c99-b5e2-38fc1793eacc","dateReserved":"2025-06-30T15:20:44.461Z"},"containers":{"cna":{"title":"CheckUser: Reflected Cross-Site Scripting (XSS) in Special:CheckUser via unsanitized internationalized message","descriptions":[{"lang":"en","value":"The CheckUser extension’s Special:CheckUser interface is vulnerable to reflected XSS via the rev-deleted-user message. This message is rendered without proper escaping, making it possible to inject JavaScript through the uselang=x-xss language override mechanism.\n\n\n\n\nThis issue affects Mediawiki - CheckUser extension: from 1.42.X before 1.42.7, from 1.43.X before 1.43.2."}],"affected":[{"vendor":"Wikimedia Foundation","product":"Mediawiki - CheckUser extension","defaultStatus":"unaffected","versions":[{"version":"1.42.x","status":"affected","lessThan":"1.42.7","versionType":"semver"},{"version":"1.43.x","status":"affected","lessThan":"1.43.2","versionType":"semver"}]}],"references":[{"url":"https://phabricator.wikimedia.org/T394693"},{"url":"https://gerrit.wikimedia.org/r/q/I159e14543912cb3bc7f4a00c3090c0285b154786"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","description":"CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"wikimedia-foundation","orgId":"c4f26cc8-17ff-4c99-b5e2-38fc1793eacc","dateUpdated":"2025-07-09T10:38:20.867Z"},"impacts":[{"capecId":"CAPEC-591","descriptions":[{"lang":"en","value":"CAPEC-591 Reflected XSS"}]}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://phabricator.wikimedia.org/T394693","tags":["exploit"]}],"metrics":[{"cvssV3_1":{"scope":"CHANGED","version":"3.1","baseScore":5.4,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","integrityImpact":"LOW","userInteraction":"REQUIRED","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"LOW","confidentialityImpact":"LOW"}},{"other":{"type":"ssvc","content":{"timestamp":"2025-07-10T13:18:02.588187Z","id":"CVE-2025-53479","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-07-10T13:18:39.505Z"}}]}}}