CVE-2025-61651
Cross-Site Scripting in Wikimedia CheckUser Module Before
Publication date: 2026-02-03
Last updated on: 2026-04-09
Assigner: wikimedia-foundation
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| mediawiki | checkuser | to 1.44.1 (exc) |
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's CheckUser extension. It occurs due to improper neutralization of input during web page generation in the file buildUserElement.Js, which can allow attackers to inject malicious scripts.
How can this vulnerability impact me? :
The vulnerability could allow attackers to execute malicious scripts in the context of the affected web application, potentially leading to unauthorized actions, data theft, or session hijacking for users interacting with the CheckUser extension.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know