Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in The Wikimedia Foundation Mediawiki -… (CVE-2026-103050)
A stored cross-site scripting (XSS) vulnerability exists in the Mediawiki MassMessage extension maintained by The Wikimedia Foundation. This vulnerability is due to improper neutralization of input during web page generation, allowing malicious scripts to be stored and executed in users' browsers. The issue affects versions before 1.46.1, 1.45.5, and 1.43.10 of the extension.
AI Analysis
Technical Summary
The Mediawiki MassMessage extension contains a stored XSS vulnerability caused by improper input neutralization during web page generation. This flaw allows attackers to inject malicious scripts that are stored and later executed in the context of users viewing the affected pages. The vulnerability affects versions prior to 1.46.1, 1.45.5, and 1.43.10 of the extension.
Potential Impact
Successful exploitation could allow an attacker to execute arbitrary scripts in the context of users' browsers, potentially leading to session hijacking, defacement, or other malicious actions within the affected Mediawiki environment.
Mitigation Recommendations
No explicit patch or remediation information is provided in the input data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Users should monitor official Wikimedia Foundation advisories for updates and apply any released patches promptly.
Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in The Wikimedia Foundation Mediawiki -… (CVE-2026-103050)
Description
A stored cross-site scripting (XSS) vulnerability exists in the Mediawiki MassMessage extension maintained by The Wikimedia Foundation. This vulnerability is due to improper neutralization of input during web page generation, allowing malicious scripts to be stored and executed in users' browsers. The issue affects versions before 1.46.1, 1.45.5, and 1.43.10 of the extension.
Affected software
pkg:github/wikimedia/mediawiki-massmessageRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Mediawiki MassMessage extension contains a stored XSS vulnerability caused by improper input neutralization during web page generation. This flaw allows attackers to inject malicious scripts that are stored and later executed in the context of users viewing the affected pages. The vulnerability affects versions prior to 1.46.1, 1.45.5, and 1.43.10 of the extension.
Potential Impact
Successful exploitation could allow an attacker to execute arbitrary scripts in the context of users' browsers, potentially leading to session hijacking, defacement, or other malicious actions within the affected Mediawiki environment.
Mitigation Recommendations
No explicit patch or remediation information is provided in the input data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Users should monitor official Wikimedia Foundation advisories for updates and apply any released patches promptly.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-9j6w-3g83-7xg8
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-103050"]
- State
- PUBLISHED
Threat ID: 6abc5d43680226ef6899ba57
Added to database: 09/30/2026, 00:52:19 UTC
Last enriched: 09/30/2026, 01:07:37 UTC
Last updated: 09/30/2026, 03:38:39 UTC
Views: 7
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.