Medium 6.3Published Apr 7, 2026

CVE-2026-39839Stored XSS through URLs in Cargo's map format

Updated under an hour ago (Oct 27, 2026, 12:50 PM ET)

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It affects Wikimedia Foundation Mediawiki - Cargo Extension and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Wikimedia Foundation Mediawiki - Cargo Extension

Exploited in the last 30 days

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.

CVSS: 6.3 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
Weakness (CWE): CWE-80
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: wikimedia-foundation
NVD analysis: Analyzed
Record last updated: Apr 7, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Wikimedia Foundation Mediawiki - Cargo Extension wikimedia_foundation:mediawiki_cargo_extension (from the name)	before 3.8.7	CNA record
mediawiki cargo mediawiki:cargo	before 3.8.7	NVD

References

References

https://phabricator.wikimedia.org/T416271	exploit, issue-tracking, vendor-advisory
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Cargo/+/1237957	patch
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Cargo/+/1237977	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.