CVE-2025-61636 Codex Special:Block vulnerable to message key XSS
An attacker can inject malicious scripts via the Special:Block page in MediaWiki, potentially leading to session hijacking or code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-61636?
CVE-2025-61636 is a cross-site scripting vulnerability in Mediawiki Mediawiki, published on 2 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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 includes/htmlform/fields/HTMLButtonField.Php.
This issue affects MediaWiki: from * before 1.39.14, 1.43.4, 1.44.1.
Weakness: CWE-79
Which versions are affected by CVE-2025-61636?
It affects 1 product.
Products include Mediawiki Mediawiki.
How do I fix CVE-2025-61636?
Upgrade to a fixed version.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2025-61636 being exploited?
There is no known exploitation of CVE-2025-61636 in the wild and no public exploit code.
Other vulnerabilities in Mediawiki Mediawiki
Sources
Also known as DEBIAN-CVE-2025-61636, GHSA-7w79-29qq-c7v3, UBUNTU-CVE-2025-61636.