What’s Vulnerable › Vulnerabilities

CVE-2026-39840: CSS injection in multiple Cargo display formats

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-07 · updated 2026-07-24
• Weakness: CWE-79

Description

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedia Foundation Mediawiki - Cargo Extension allows XSS Targeting Non-Script Elements.This issue affects Mediawiki - Cargo Extension: before 3.8.7.

Affected products

• The Wikimedia Foundation Mediawiki - Cargo extension: before 3.8.7 — fixed in 3.8.7

How to fix

Upgrade to a fixed version: The Wikimedia Foundation Mediawiki - Cargo extension 3.8.7. Check the vendor advisory for mitigations.

References

• https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Cargo/+/1237966
• https://phabricator.wikimedia.org/T416368

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