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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00171.

Exploitation poc

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
MediaWiki MassMessage unaffected
Version Status Constraints
0 affected < 1.40.2

No data.

No data.

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No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://lists.wikimedia.org/hyperkitty/list/mediawiki-announce@lists.wikimedia.org/message/TDBUBCCOQJUT4SCHJNPHKQNPBUUETY52/ cve-icon cve-icon
https://phabricator.wikimedia.org/T347742 cve-icon cve-icon cve-icon
History

Tue, 15 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Title MassMessage Extension XSS via i18n Key

Mon, 14 Sep 2026 23:00:00 +0000

Type Values Removed Values Added
Title MassMessage Extension Cross‑Site Scripting via i18n Key in MediaWiki

Mon, 14 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 14 Sep 2026 12:45:00 +0000

Type Values Removed Values Added
Title MassMessage Extension Cross‑Site Scripting via i18n Key in MediaWiki

Mon, 14 Sep 2026 07:00:00 +0000

Type Values Removed Values Added
Description 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.
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-09-14T15:23:47.638Z

Reserved: 2024-01-12T00:00:00.000Z

Link: CVE-2024-23176

cve-icon Vulnrichment

Updated: 2026-09-14T15:23:23.028Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-14T07:17:16.097

Modified: 2026-09-16T19:31:54.210

Link: CVE-2024-23176

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-15T16:15:15Z

Weaknesses