CVE-2026-103050
Received Received - Intake

Stored XSS in MediaWiki MassMessage Extension

Publication date: 2026-09-30

Last updated on: 2026-09-30

Assigner: wikimedia-foundation

Description
Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in The Wikimedia Foundation Mediawiki - MassMessage extension allows Stored XSS. This issue affects Mediawiki - MassMessage extension: before 1.46.1, 1.45.5, 1.43.10.

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Meta Information

Published
2026-09-30
Last Modified
2026-09-30
Generated
2026-09-30
AI Q&A
2026-09-30
EPSS Evaluated
N/A
NVD
CVE-2026-103050
EUVD
EUVD-2026-89503

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
the_wikimedia_foundation mediawiki_massmessage_extension to 1.46.1 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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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

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Executive Summary

This is a stored cross-site scripting (XSS) vulnerability in the Wikimedia Foundation MediaWiki MassMessage extension. It occurs due to improper neutralization of input during web page generation, allowing attackers to inject malicious scripts that are stored on the server and executed when other users view the affected pages.

Impact Analysis

An attacker could exploit this to steal user sessions, redirect users to malicious sites, or perform actions on behalf of users. Users viewing compromised pages may have their data exposed or their accounts compromised without their knowledge.

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, reputational damage, and loss of trust if exploited.

Mitigation Strategies

Update the MediaWiki MassMessage extension to version 1.46.1, 1.45.5, or 1.43.10 or later to address the stored XSS vulnerability.

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