CVE-2025-61650 UserInfoCard is vulnerable to message key stored XSS
An attacker can inject malicious scripts via message keys in the CheckUser UserInfoCard, potentially leading to session hijacking or code execution.
- 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
- None listed
What is CVE-2025-61650?
CVE-2025-61650 is a low-severity cross-site scripting vulnerability in Wikimedia Foundation CheckUser, published on 3 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 CheckUser. This vulnerability is associated with program files src/Services/CheckUserUserInfoCardService.Php.
This issue affects CheckUser: from * before 795bf333272206a0189050d975e94b70eb7dc507.
Weakness: CWE-79
Which versions are affected by CVE-2025-61650?
How do I fix CVE-2025-61650?
No fix has been published for CVE-2025-61650 yet. Limit exposure of the affected software until one is available.
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-2025-61650 being exploited?
There is no known exploitation of CVE-2025-61650 in the wild and no public exploit code.
Sources
Also known as GHSA-x877-5r2w-379h.