CVE-2026-103046

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Stored XSS in MediaWiki WikiLambda Extension

Publication date: 2026-09-29

Last updated on: 2026-09-30

Assigner: wikimedia-foundation

Description

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedia Foundation MediaWiki - WikiLambda extension allows Stored XSS. This issue affects MediaWiki - WikiLambda extension: before 1.46.1.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-29

Last Modified

2026-09-30

Generated

2026-10-19

AI Q&A

2026-09-30

EPSS Evaluated

2026-10-18

NVD

CVE-2026-103046

EUVD

EUVD-2026-89478

Affected Vendors & Products

Vendor	Product	Version / Range
wikimedia	mediawiki_wikilambda_extension	to 1.46.1 (exc)

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 is a stored cross-site scripting (XSS) vulnerability in the Wikimedia Foundation MediaWiki - WikiLambda extension. It allows an attacker to inject malicious scripts into web pages that are then stored and served to other users. The issue affects versions before 1.46.1.

Detection Guidance

Detection of this stored XSS vulnerability in MediaWiki WikiLambda extension requires checking the extension version and inspecting user input handling. Verify if the WikiLambda extension version is before 1.46.1. Check server logs for unusual script injections in stored data.

Impact Analysis

An attacker could exploit this to steal user sessions, deface web pages, or redirect users to malicious sites. Users visiting affected pages may have their data compromised or be tricked into revealing sensitive information.

Compliance Impact

This vulnerability could lead to unauthorized access to personal data, violating GDPR and HIPAA requirements for data protection and confidentiality. Organizations may face legal penalties and reputational damage if exploited.

Mitigation Strategies

Update the MediaWiki - WikiLambda extension to version 1.46.1 or later to address the stored XSS vulnerability.

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