{"id":"CVE-2023-37252","title":"An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3","summary":"An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. Special:CheckUserLog shows usernames that have been hidden.","severity":"low","cvss":3.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","cwe":["CWE-669"],"vendor":"MediaWiki","product":"CheckUser","affected":["CheckUser < 1.35.11","CheckUser >= 1.36.0 < 1.38.7","CheckUser >= 1.39.0 < 1.39.4"],"published":"2026-09-14","updated":"2026-09-16","sourceUpdated":"2026-09-16T19:31:54.210","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-37252","references":[{"url":"https://phabricator.wikimedia.org/T330968","label":"cve@mitre.org"},{"url":"https://phabricator.wikimedia.org/T330968","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00197,"epssPercentile":0.09698,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-14T16:16:37.844636Z"},"ingestedAt":"2026-09-14T15:23:07.466Z","slug":"CVE-2023-37252","body":"## Overview\n\nAn issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. Special:CheckUserLog shows usernames that have been hidden.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":29,"depthScoreParts":{"impact":17.1,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":203078,"id":"CVE-2023-37252","ts":1789409572338,"field":"exploit_available","old":"false","new":"true"}]}