Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in ChurchCRM - CVE-2026-39344
Published: May 5, 2026
Vulnerability identifier: #VU129711
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-39344
CWE-ID: CWE-80
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: ChurchCRM
Affected software:
ChurchCRM
ChurchCRM
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary script in the victim's browser.
The vulnerability exists due to improper neutralization of script-related HTML tags in the login page username parameter handling in begin-session.php when rendering the login page with a user-supplied username query parameter. A remote attacker can send a specially crafted link to execute arbitrary script in the victim's browser.
User interaction is required to open a crafted login page URL.
How to mitigate CVE-2026-39344
Install security update from vendor's website.