---
id: CVE-2026-103050
title: Stored i18n XSS in MassMessage
summary: >-
  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: be…
severity: none
cwe:
  - CWE-79
vendor: The Wikimedia Foundation
product: Mediawiki - MassMessage extension
affected:
  - 'mediawiki_-_massmessage_extension < 1.46.1, 1.45.5, 1.43.10'
published: '2026-09-29'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T23:11:02.272Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-103050'
references:
  - url: 'https://phabricator.wikimedia.org/T432341'
  - url: 'https://gerrit.wikimedia.org/r/c/1346089'
tags:
  - cve.org
ingestedAt: '2026-09-29T23:52:50.546Z'
---

## Overview

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.

## Affected

- `mediawiki_-_massmessage_extension < 1.46.1, 1.45.5, 1.43.10`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.