CVE-2025-11261
Unknown Unknown - Not Provided
Cross-Site Scripting in MediaWiki Language.js Enables Code Injection

Publication date: 2026-02-03

Last updated on: 2026-03-25

Assigner: wikimedia-foundation

Description
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files resources/src/mediawiki.Language/mediawiki.Language.Js. This issue affects MediaWiki: from * before 1.39.15, 1.43.5, 1.44.2.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2026-02-03
Last Modified
2026-03-25
Generated
2026-06-16
AI Q&A
2026-02-03
EPSS Evaluated
2026-06-15
NVD
CVE-2025-11261
EUVD
EUVD-2025-206639
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
mediawiki mediawiki to 1.39.15 (exc)
mediawiki mediawiki From 1.43.0 (inc) to 1.43.5 (exc)
mediawiki mediawiki From 1.44.0 (inc) to 1.44.2 (exc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Executive Summary

This vulnerability is a Cross-site Scripting (XSS) issue in Wikimedia Foundation MediaWiki. It occurs due to improper neutralization of input during web page generation, specifically in the program files resources/src/mediawiki.Language/mediawiki.Language.Js. This means that malicious scripts can be injected into web pages, potentially executed by users viewing those pages.

Impact Analysis

The vulnerability can allow attackers to execute malicious scripts in the context of the affected web pages. This can lead to unauthorized actions such as stealing user credentials, session hijacking, or defacing web content, thereby compromising user security and trust.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

I don't know

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2025-11261. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart