CVE-2026-39344 Reflected XSS the login page through the 'username' parameter
Attackers can execute malicious scripts via the username parameter on the login page, potentially stealing session cookies or hijacking user accounts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-39344?
CVE-2026-39344 is a high-severity cross-site scripting vulnerability in Churchcrm Churchcrm, published on 7 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
ChurchCRM is an open-source church management system. Prior to 7.1.0, there is a Reflected Cross-Site Scripting (XSS) vulnerability on the login page, which is caused by the lack of sanitization or encoding of the username parameter received from the URL. The username parameter value is directly displayed in the login page input element without filter, allowing attackers to insert malicious JavaScript scripts. If successful, script can be executed on the client side, potentially stealing sensitive data such as session cookies or replacing the display to show the attacker's login form. This vulnerability is fixed in 7.1.0.
Which versions are affected by CVE-2026-39344?
It affects 1 product.
Products include Churchcrm Churchcrm.
How do I fix CVE-2026-39344?
No fix has been published for CVE-2026-39344 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-2026-39344 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39344 exists.
Other vulnerabilities in Churchcrm Churchcrm
Sources
Also known as GHSA-rx8c-j7x8-w3hj.