Stored XSS in Wikimedia Foundation MediaWiki Cargo Extension
CVE-2026-39841

6.3MEDIUM

Key Information:

Vendor

Wikimedia Foundation

Status
Mediawiki - Cargo Extension
Vendor
CVE Published:
7 April 2026

What is CVE-2026-39841?

A vulnerability in the MediaWiki Cargo Extension of Wikimedia Foundation allows for Stored Cross-Site Scripting (XSS) due to improper handling of script-related HTML tags in web pages. This flaw, present in versions prior to 3.8.7, can be exploited to inject malicious scripts, potentially compromising user interactions and data integrity within affected installations.

Affected Version(s)

Mediawiki - Cargo Extension 0 < 3.8.7

References

https://phabricator.wikimedia.org/T416389
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Car...

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Alex44019
.