An issue was discovered in MediaWiki before 1.35.9, 1.36.x through 1.38.x before 1.38.5, and 1.39.x before 1.39.1. There is XSS in Wikibase date formatting via wikibase-time-precision-* fields. This allows JavaScript execution by staff/admin users who do not intentionally have the editsitejs capability.
| Software | From | Fixed in |
|---|---|---|
| mediawiki / mediawiki | - | 1.35.9 |
| mediawiki / mediawiki | 1.36.0 | 1.38.5 |
| mediawiki / mediawiki | 1.39.0-rc0 | 1.39.0-rc0.x |
| mediawiki / mediawiki | 1.39.0-rc1 | 1.39.0-rc1.x |
| mediawiki / mediawiki | 1.39.0 | 1.39.0.x |