Medium severity6.5NVD Advisory· Published Apr 22, 2021· Updated Jun 17, 2026
CVE-2021-31553
CVE-2021-31553
Description
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
4- MediaWiki/CheckUser extensiondescription
Patches
Vulnerability mechanics
References
7- gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666963nvdIssue TrackingThird Party Advisory
- gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666964nvdIssue TrackingThird Party Advisory
- gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667023nvdIssue TrackingThird Party Advisory
- gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667024nvdIssue TrackingThird Party Advisory
- gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667025nvdIssue TrackingThird Party Advisory
- gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667027nvdIssue TrackingThird Party Advisory
- phabricator.wikimedia.org/T275669nvdThird Party Advisory
News mentions
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