CVE-2026-39933
Cross-Site Scripting in MediaWiki GlobalWatchlist Extension
Publication date: 2026-04-07
Last updated on: 2026-04-08
Assigner: wikimedia-foundation
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| the_wikimedia_foundation | mediawiki_globalwatchlist_extension | * |
Helpful Resources
Exploitability
| 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 Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a Cross-Site Scripting (XSS) issue in the Wikimedia Foundation Mediawiki - GlobalWatchlist Extension. It occurs due to improper neutralization of input during web page generation, which means that malicious scripts can be injected and executed in the context of the affected web pages.
How can this vulnerability impact me? :
The vulnerability can allow attackers to execute arbitrary scripts in the context of users visiting the affected Mediawiki pages. This can lead to theft of sensitive information, session hijacking, defacement of web content, or redirection to malicious sites.