CVE-2025-61642 Stored XSS through system messages provided to CodexHtmlForms
Stored XSS in MediaWiki allows attackers to inject scripts via system messages, potentially leading to code execution or account takeover.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2025-61642?
CVE-2025-61642 is a cross-site scripting vulnerability in Mediawiki Mediawiki, published on 2 Feb 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
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/CodexHTMLForm.Php, 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-2025-61642?
It affects 1 product.
Products include Mediawiki Mediawiki.
How do I fix CVE-2025-61642?
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-2025-61642 being exploited?
There is no known exploitation of CVE-2025-61642 in the wild and no public exploit code.
Other vulnerabilities in Mediawiki Mediawiki
Sources
Also known as DEBIAN-CVE-2025-61642, GHSA-cc7r-67vc-28jh, UBUNTU-CVE-2025-61642.