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8.1

ChurchCRM login page can run malicious code via username

CVE-2026-39344 · published 7 months ago
Summary

The login screen of ChurchCRM versions before 7.1.0 shows the username taken from the web address without cleaning it. An attacker could craft a link that inserts harmful JavaScript, which could steal session data or show a fake login form. Upgrade to version 7.1.0 or later to stop this risk.

Original advisory text
Reflected XSS the login page through the 'username' parameter
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.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
8.1 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-79Cross-site Scripting (XSS)
CWE-80Basic XSS
Timeline
Published7 Apr 2026
Updated4 Nov 2026
First seen7 Apr 2026
Sources
CVE-2026-39344 · NVD
CVE-2026-39344 · OSV
GHSA-rx8c-j7x8-w3hj · GHSA
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