| Package | Affected versions | Patched versions |
|---|---|---|
| mediawiki | ≥ 1.12.0, < 1.35.1 | 1.35.1 |
MediaWiki before 1.35.1 allows XSS via BlockLogFormatter.php. Language::translateBlockExpiry itself does not escape in all code paths. For example, the return of Language::userTimeAndDate is is always unsafe for HTML in a month value. This affects MediaWiki 1.12.0 and later.
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