CVSS 3.1
6.5 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:LCVE-2021-31553
Medium (6.5) in mediawiki mediawiki. EPSS 1.4% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 1.4% chance of exploitation in the next 30 days; higher than 72% of CVEs (scores of 2026-10-31)
- CWE
- CWE-428
- Published
- Modified
- Record from
- the NVD, synced
Affected
- mediawiki:mediawiki
References
- https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666963
- https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666964
- https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667023
- https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667024
- https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667025