What’s Vulnerable › Vulnerabilities

CVE-2021-42041

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-10-06 · updated 2026-06-17
• Weakness: CWE-79

Description

An issue was discovered in CentralAuth in MediaWiki through 1.36.2. The rightsnone MediaWiki message was not being properly sanitized and allowed for the injection and execution of HTML and JavaScript via the setchange log.

Affected products

• Wikimedia Foundation MediaWiki: through 1.36.2

References

• https://gerrit.wikimedia.org/r/q/I7aeaa6e4de5ccaa5eeb6bf4fb00c96b01d5fea35
• https://phabricator.wikimedia.org/T291696
• https://gerrit.wikimedia.org/r/q/I7aeaa6e4de5ccaa5eeb6bf4fb00c96b01d5fea35
• https://phabricator.wikimedia.org/T291696

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