{"id":"CVE-2023-37255","details":"An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. In Special:CheckUser, a check of the \"get edits\" type is vulnerable to HTML injection through the User-Agent HTTP request header.","aliases":["BIT-mediawiki-2023-37255"],"modified":"2026-03-14T12:08:12.168424Z","published":"2023-06-29T16:15:10.043Z","references":[{"type":"REPORT","url":"https://phabricator.wikimedia.org/T333569"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/wikimedia/mediawiki","events":[{"introduced":"0"},{"last_affected":"2fdadd4096268cebab8fbc2f245dd441e2f05536"}],"database_specific":{"versions":[{"introduced":"0"},{"last_affected":"1.39.3"}]}}],"versions":["1.1.0","1.3.0beta1","1.39.0","1.39.0-rc.0","1.39.0-rc.1","1.39.1","1.39.2","1.39.3","1.5.0alpha1","1.5.0alpha2","1.5.0beta1","1.5.0beta2","1.5.0beta3","1.5.0beta4","1.6.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-37255.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"}]}