What’s Vulnerable › Vulnerabilities

CVE-2024-47840: Stored XSS through sidebar in Apex skin

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2024-10-05 · updated 2026-06-17
• Weakness: CWE-79

Description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in The Wikimedia Foundation Mediawiki - Apex skin allows Stored XSS.This issue affects Mediawiki - Apex skin: from 1.39.X before 1.39.9, from 1.41.X before 1.41.3, from 1.42.X before 1.42.2.

Affected products

• The Wikimedia Foundation Mediawiki - Apex skin: from 1.13.0 before 1.39.9; from 1.41.0 before 1.41.3; from 1.42.0 before 1.42.2 — fixed in 1.39.9, 1.41.3, 1.42.2

How to fix

Upgrade to a fixed version: The Wikimedia Foundation Mediawiki - Apex skin 1.39.9, 1.41.3, 1.42.2. Check the vendor advisory for mitigations.

References

• https://gerrit.wikimedia.org/r/q/Id9093783051c3f8e6dcb5dc89f9493a5f5cf7bd7
• https://phabricator.wikimedia.org/T368628
• https://phabricator.wikimedia.org/T370081

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