CVE-2026-40593 ChurchCRM: Stored XSS in UserEditor.php via Login Name Field
An administrator can inject malicious scripts via the username field, leading to stored XSS that executes in other administrators' browsers.
- 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-2026-40593?
CVE-2026-40593 is a medium-severity cross-site scripting vulnerability in ChurchCRM CRM, published on 18 Apr 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
ChurchCRM is an open-source church management system. In versions prior to 7.2.0, the User Editor (UserEditor.php) renders stored usernames directly into an HTML input value attribute without applying htmlspecialchars(). An administrator can save a username containing HTML attribute-breaking characters and event handlers, which execute in the browser of any administrator who subsequently views that user's editor page, resulting in stored XSS. This issue has been fixed in version 7.2.0.
Which versions are affected by CVE-2026-40593?
How do I fix CVE-2026-40593?
No fix has been published for CVE-2026-40593 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-2026-40593 being exploited?
There is no known exploitation of CVE-2026-40593 in the wild and no public exploit code.
Sources
Also known as GHSA-7h46-9f64-p49q.