What’s Vulnerable › Vulnerabilities

CVE-2026-39837: Stored XSS through the dynamic table format in Cargo

• Severity: medium (CVSS 5.4 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-80

Description

Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in WikiWorks Mediawiki - Cargo Extension allows Stored XSS.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/+/1237979
• https://phabricator.wikimedia.org/T416402

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