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.
References (7)
Scores
CVSS v3
6.5
EPSS
0.0067
EPSS Percentile
71.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Details
CWE
CWE-428
Status
published
Products (1)
mediawiki/mediawiki
< 1.35.2
Published
Apr 22, 2021
Tracked Since
Feb 18, 2026