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An issue was discovered in the CheckUser extension for MediaWiki through 1.35.2. MediaWiki usernames with trailing whitespace could be stored in the cu_log database table such that denial of service occurred for certain CheckUser extension pages and functionality. For example, the attacker could turn off Special:CheckUserLog and thus interfere with usage tracking.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Mediawiki | — | Upgrade MediaWiki to the latest version | Apr 26, 2021 | Apr 22, 2021 |
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