CVE-2021-39186: Miraheze Globalnewfiles

Medium severity, CVSS 6.1. EPSS: 1% chance of exploitation in the next 30 days.

GlobalNewFiles is a MediaWiki extension maintained by Miraheze. Prior to commit number cee254e1b158cdb0ddbea716b1d3edc31fa4fb5d, the username column of the GlobalNewFiles special page is vulnerable to a stored XSS. Commit number cee254e1b158cdb0ddbea716b1d3edc31fa4fb5d contains a patch. As a workaround, one may disallow <,> (or other characters required to insert html/js) from being used in account names so an XSS is not possible.

Affected products

• Miraheze Globalnewfiles: before 2021-09-01 (fixed in 2021-09-01)

Published 2021-09-01. Last modified 2026-06-17.