An issue was discovered in MediaWiki before 1.35.12, 1.36.x through 1.39.x before 1.39.5, and 1.40.x before 1.40.1. There is XSS in youhavenewmessagesmanyusers and youhavenewmessages i18n messages. This is related to MediaWiki:Youhavenewmessagesfromusers.
| Software | From | Fixed in |
|---|---|---|
| mediawiki / mediawiki | 1.40.0 | 1.40.0.x |
| mediawiki / mediawiki | - | 1.35.12 |
| mediawiki / mediawiki | 1.40.0-rc0 | 1.40.0-rc0.x |
| mediawiki / mediawiki | 1.39.0 | 1.39.5 |