What’s Vulnerable › Vulnerabilities

CVE-2020-10960

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-04-03 · updated 2026-06-17
• Weakness: CWE-74

Description

In MediaWiki before 1.34.1, users can add various Cascading Style Sheets (CSS) classes (which can affect what content is shown or hidden in the user interface) to arbitrary DOM nodes via HTML content within a MediaWiki page. This occurs because jquery.makeCollapsible allows applying an event handler to any Cascading Style Sheets (CSS) selector. There is no known way to exploit this for cross-site scripting (XSS).

Affected products

• Wikimedia Foundation MediaWiki: before 1.34.1 — fixed in 1.34.1

How to fix

Upgrade to a fixed version: Wikimedia Foundation MediaWiki 1.34.1. Check the vendor advisory for mitigations.

References

• https://lists.wikimedia.org/pipermail/wikitech-l/2020-March/093243.html
• https://phabricator.wikimedia.org/T246602
• https://lists.wikimedia.org/pipermail/wikitech-l/2020-March/093243.html
• https://phabricator.wikimedia.org/T246602

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