---
id: CVE-2024-23176
title: >-
  An issue was discovered in the MassMessage extension in MediaWiki before
  1.40.2
summary: >-
  An issue was discovered in the MassMessage extension in MediaWiki before
  1.40.2. For a Special:MassMessage?uselang=x-xss URL, the i18n key
  massmessage-form-page-help allows XSS.
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: Red Hat
product: MassMessage
affected:
  - MassMessage < 1.40.2
published: '2026-09-14'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T19:31:54.210'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-23176'
references:
  - url: >-
      https://lists.wikimedia.org/hyperkitty/list/mediawiki-announce@lists.wikimedia.org/message/TDBUBCCOQJUT4SCHJNPHKQNPBUUETY52/
    label: cve@mitre.org
  - url: 'https://phabricator.wikimedia.org/T347742'
    label: cve@mitre.org
  - url: 'https://phabricator.wikimedia.org/T347742'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-23176.json
  - url: 'https://access.redhat.com/security/cve/CVE-2024-23176'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2024-23176'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - cve.org
  - exploit-available
epss: 0.00209
epssPercentile: 0.0989
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-14T15:23:37.190582Z'
ingestedAt: '2026-09-14T15:23:07.464Z'
---

## Overview

An issue was discovered in the MassMessage extension in MediaWiki before 1.40.2. For a Special:MassMessage?uselang=x-xss URL, the i18n key massmessage-form-page-help allows XSS.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-23176.json)