CVE-2026-39841: Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in Wikimedia Found

Q: How do I fix CVE-2026-39841?

cargo: upgrade to 3.8.7. Exact commands for each OS are on this page.

Q: Is CVE-2026-39841 being exploited?

CVE-2026-39841 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-39841 affect?

CVE-2026-39841 affects cargo. Severity is medium (CVSS 6.1). 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.

Q: How urgent is CVE-2026-39841?

Priority 28/100. Public exploit reference

Routine

MEDIUM 6.1UPGRADE

CVE-2026-39841 is a medium-severity flaw (CVSS 6.1) affecting cargo. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-80, CWE-79
Published	2026-04-07
Last modified	2026-07-24

Publisher (CNA): wikimedia-foundation · Vendor: mediawiki

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-07 20:16 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

mediawiki cargo UPGRADE

Affected: < 3.8.7

Fixed in: 3.8.7

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy cargo || rpm -q cargo || cargo --version

2. UPGRADE to 3.8.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cargo

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cargo

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-39841?

cargo: upgrade to 3.8.7. Exact commands for each OS are on this page.

Is CVE-2026-39841 being exploited?

CVE-2026-39841 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-39841 affect?

CVE-2026-39841 affects cargo. Severity is medium (CVSS 6.1). 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.

How urgent is CVE-2026-39841?

Priority 28/100. Public exploit reference

Related CVEs

CVE-2026-58519 MEDIUM 5.4 UPGRADE Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in The Wiki
CVE-2026-58521 CRITICAL 9.8 UPGRADE Improper neutralization of special elements used in an SQL command ('SQL injection') vulnerability in The Wiki
CVE-2026-14363 CRITICAL 9.8 UPGRADE Improper neutralization of special elements used in an SQL command ('SQL injection') vulnerability in The Wiki
CVE-2026-39840 MEDIUM 6.1 UPGRADE Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedi
CVE-2026-39839 MEDIUM 6.1 UPGRADE Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in Wikimedia Found

References

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