What’s Vulnerable › Vulnerabilities

CVE-2020-10959

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-06-02 · updated 2026-06-17
• Weakness: CWE-601

Description

resources/src/mediawiki.page.ready/ready.js in MediaWiki before 1.35 allows remote attackers to force a logout and external redirection via HTML content in a MediaWiki page.

Affected products

• Wikimedia Foundation MediaWiki: before 1.35 — fixed in 1.35

How to fix

Upgrade to a fixed version: Wikimedia Foundation MediaWiki 1.35. Check the vendor advisory for mitigations.

References

• https://gerrit.wikimedia.org/r/c/mediawiki/core/+/536725
• https://phabricator.wikimedia.org/T232932
• https://phabricator.wikimedia.org/T240393
• https://gerrit.wikimedia.org/r/c/mediawiki/core/+/536725
• https://phabricator.wikimedia.org/T232932
• https://phabricator.wikimedia.org/T240393

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