CVE-2026-96874

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Stored XSS in MediaWiki Cargo Extension

Publication date: 2026-09-25

Last updated on: 2026-09-29

Assigner: wikimedia-foundation

Description

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in the Mediawiki - Cargo extension allows Stored XSS. This issue affects Mediawiki - Cargo extension: through 3.9.4.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-25

Last Modified

2026-09-29

Generated

2026-10-16

AI Q&A

2026-09-25

EPSS Evaluated

2026-10-14

NVD

CVE-2026-96874

EUVD

EUVD-2026-87112

Affected Vendors & Products

Vendor	Product	Version / Range
mediawiki	cargo	to 3.9.4 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

This vulnerability is a stored cross-site scripting (XSS) issue in the Mediawiki - Cargo extension versions up to 3.9.4. It allows attackers to inject malicious scripts into web pages by improperly neutralizing user input during page generation.

Detection Guidance

Detection of this stored XSS vulnerability in the MediaWiki Cargo extension requires manual inspection of user inputs and rendered pages. Check for unusual script tags or event handlers in wiki pages or form inputs. Review extension version to confirm if it is 3.9.4 or earlier.

Impact Analysis

An attacker could exploit this to steal user sessions, deface web pages, or perform actions on behalf of users. It primarily affects users interacting with vulnerable Mediawiki instances using the Cargo extension.

Compliance Impact

This XSS vulnerability could lead to unauthorized data access or modification, potentially violating GDPR (data protection) or HIPAA (health data privacy) by exposing sensitive user information.

Mitigation Strategies

Immediately update the MediaWiki Cargo extension to the latest version beyond 3.9.4. If an update is unavailable, disable the extension until a patch is released. Sanitize all user inputs and implement strict output encoding in wiki pages.

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