What’s Vulnerable › Vulnerabilities

CVE-2020-25869

• Severity: high (CVSS 7.5 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: none known
• Published: 2020-09-27 · updated 2026-06-17
• Weakness: CWE-863

Description

An information leak was discovered in MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4. Handling of actor ID does not necessarily use the correct database or correct wiki.

Affected products

• Fedoraproject Fedora: 33
• Wikimedia Foundation MediaWiki: before 1.31.10; from 1.32.0 before 1.34.4 — fixed in 1.31.10, 1.34.4

How to fix

Upgrade to a fixed version: Wikimedia Foundation MediaWiki 1.31.10, 1.34.4. Check the vendor advisory for mitigations.

References

• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RTTPZ7XMDS66I442OLLHXBDNP2LCBJU6/
• https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048480.html
• https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048488.html
• https://phabricator.wikimedia.org/T260485
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RTTPZ7XMDS66I442OLLHXBDNP2LCBJU6/
• https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048480.html
• https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048488.html
• https://phabricator.wikimedia.org/T260485

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