An issue was discovered in MediaWiki 1.34.x before 1.34.4. On Special:Contributions, the NS filter uses unescaped messages as keys in the option key for an HTMLForm specifier. This is vulnerable to a mild XSS if one of those messages is changed to include raw HTML.
| Software | From | Fixed in |
|---|---|---|
| mediawiki / mediawiki | 1.34.0 | 1.34.4 |
| fedoraproject / fedora | 33 | 33.x |