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.
{
"unresolved_ranges": [
{
"source": "DESCRIPTION",
"extracted_events": [
{
"fixed": "1.39.3"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/37xxx/CVE-2023-37255.json",
"cna_assigner": "mitre"
}