What’s Vulnerable › Vulnerabilities

CVE-2020-27957

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-10-28 · updated 2026-06-17
• Weakness: CWE-79

Description

The RandomGameUnit extension for MediaWiki through 1.35 was not properly escaping various title-related data. When certain varieties of games were created within MediaWiki, their names or titles could be manipulated to generate stored XSS within the RandomGameUnit extension.

Affected products

• Wikimedia Foundation MediaWiki: through 1.35

References

• https://gerrit.wikimedia.org/r/q/I497d2076038f75c9eb77e0e250f2af56f5bd2bfc
• https://phabricator.wikimedia.org/T266400
• https://gerrit.wikimedia.org/r/q/I497d2076038f75c9eb77e0e250f2af56f5bd2bfc
• https://phabricator.wikimedia.org/T266400

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