Bug 2532896 (CVE-2024-23176)

Summary: CVE-2024-23176 MassMessage: mediawiki: MediaWiki MassMessage: Cross-Site Scripting (XSS) via crafted URL allows arbitrary script execution.
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the MassMessage extension of MediaWiki. This vulnerability, known as Cross-Site Scripting (XSS), allows a remote attacker to inject malicious scripts into web pages viewed by other users. The flaw occurs when a specially crafted URL, specifically `Special:MassMessage?uselang=x-xss`, is used, exploiting the `i18n` key `massmessage-form-page-help`. Successful exploitation could lead to information disclosure, session hijacking, or defacement of the affected web page.
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Description OSIDB Bzimport 2026-09-14 07:02:43 UTC
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.