UpHeron
All vulnerabilities

Servers and applications

CVE-2021-31553

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
Medium 6.5
Published
22 Apr 2021
Last changed
17 Jun 2026
Added to UpHeron
21 Oct 2026
Sources
NVD

Affected software

SoftwareAffected versions
MediaWikiServers and applications · cpe:a:mediawiki:mediawiki
  • Every version up to 1.35.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-31553
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-31553