CVE-2026-39839

MEDIUM 6.1CVE-2026-39839 · Published 07/04/2026 · updated 24/07/2026

In short

CVE-2026-39839 is a MEDIUM (CVSS 6.1) vulnerability affecting cargo (mediawiki).
Chance of exploitation in the next 30 days (EPSS): 0.18%, higher than 7.7% of all vulnerabilities.
Fix: update to 3.8.7 or later.

Package	Affected versions	Patched versions
cargo mediawiki	`< 3.8.7`	`3.8.7`

Description

Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in Wikimedia Foundation Mediawiki - Cargo Extension allows Stored XSS.This issue affects Mediawiki - Cargo Extension: before 3.8.7.

References

gerrit.wikimedia.org/r/c/mediawiki/extensions/Cargo/+/1237957 · Patch
gerrit.wikimedia.org/r/c/mediawiki/extensions/Cargo/+/1237977 · Patch
phabricator.wikimedia.org/T416271 · Exploit

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Package

Affected versions

Patched versions

cargo

mediawiki

< 3.8.7

3.8.7

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