What is CVE-2026-39841?

CVE-2026-39841 is a medium-severity vulnerability in MediaWiki Cargo, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 6.1/10. Published 2026-04-07.

How severe is CVE-2026-39841?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in MediaWiki Cargo

CVE-2026-39841

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.

Published 2026-04-07 · last modified 2026-07-24.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (13.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 14th percentile — 13.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.001

Affected products

MediaWiki Cargo
Wikimedia Foundation MediaWiki - Cargo Extension — versions 0

Weakness classification (CWE)

References

c4f26cc8-17ff-4c99-b5e2-38fc1793eacc (Exploit, Issue Tracking, Vendor Advisory)
c4f26cc8-17ff-4c99-b5e2-38fc1793eacc (Patch)

Frequently asked questions

What is CVE-2026-39841?: CVE-2026-39841 is a medium-severity vulnerability in MediaWiki Cargo, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 6.1/10. Published 2026-04-07.
How severe is CVE-2026-39841?: Medium severity. CVSS v3 base score is 6.1 out of 10.