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.
CVE ID: CVE-2023-37255
CVSS Base Severity: LOW
CVSS Base Score: 0.0
Vendor: n/a
Product: n/a
EPSS Score: 0.08% (probability of being exploited)
EPSS Percentile: 36.12% (scored less or equal to compared to others)
EPSS Date: 2025-02-03 (when was this score calculated)