AUGUST 4, 2026
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Case File

CVE-2021-31553

MEDIUM · CVSS 6.5 EPSS 1.40%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-04-22 · Last synced 2026-08-04

CyberRota Analysis

AI analysis pending.

CVE
CVE-2021-31553
Severity
MEDIUM
CVSS
6.5
EPSS
1.40%

Original NVD 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.