CVE-2026-39940: CWE-601: URL Redirection to Untrusted Site ('Open Redirect') in ChurchCRM CRM
ChurchCRM is an open-source church management system. Prior to 7.0.0, it was possible in many places across the ChurchCRM application to create a link that, when visited by an authenticated user, would redirect them to any URL chosen by an attacker if they clicked 'Cancel' button on the page. For this write-up the DonatedItemEditor.php will be used as an example, however wherever all instances of 'linkBack' should be assessed. This vulnerability is fixed in 7.0.0.
AI Analysis
Technical Summary
CVE-2026-39940 is an open redirect vulnerability in ChurchCRM prior to version 7.0.0. The issue arises from improper validation of the 'linkBack' parameter used in multiple places across the application, including the DonatedItemEditor.php page. An attacker can exploit this by crafting a URL that, when visited by an authenticated user who clicks the 'Cancel' button, redirects the user to an attacker-controlled external site. This vulnerability was addressed and fixed in ChurchCRM version 7.0.0.
Potential Impact
An attacker can use this vulnerability to redirect authenticated users to arbitrary external URLs, potentially leading to phishing or other social engineering attacks. However, the vulnerability requires the user to be authenticated and to click the 'Cancel' button on a vulnerable page. There is no indication of direct code execution or data compromise from this vulnerability alone.
Mitigation Recommendations
Upgrade ChurchCRM to version 7.0.0 or later, where this open redirect vulnerability has been fixed. Since the vulnerability is resolved in the official release, no additional mitigation steps are required beyond applying the update.
CVE-2026-39940: CWE-601: URL Redirection to Untrusted Site ('Open Redirect') in ChurchCRM CRM
Description
ChurchCRM is an open-source church management system. Prior to 7.0.0, it was possible in many places across the ChurchCRM application to create a link that, when visited by an authenticated user, would redirect them to any URL chosen by an attacker if they clicked 'Cancel' button on the page. For this write-up the DonatedItemEditor.php will be used as an example, however wherever all instances of 'linkBack' should be assessed. This vulnerability is fixed in 7.0.0.
CVSS v4.0
Score 5.3medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-39940 is an open redirect vulnerability in ChurchCRM prior to version 7.0.0. The issue arises from improper validation of the 'linkBack' parameter used in multiple places across the application, including the DonatedItemEditor.php page. An attacker can exploit this by crafting a URL that, when visited by an authenticated user who clicks the 'Cancel' button, redirects the user to an attacker-controlled external site. This vulnerability was addressed and fixed in ChurchCRM version 7.0.0.
Potential Impact
An attacker can use this vulnerability to redirect authenticated users to arbitrary external URLs, potentially leading to phishing or other social engineering attacks. However, the vulnerability requires the user to be authenticated and to click the 'Cancel' button on a vulnerable page. There is no indication of direct code execution or data compromise from this vulnerability alone.
Mitigation Recommendations
Upgrade ChurchCRM to version 7.0.0 or later, where this open redirect vulnerability has been fixed. Since the vulnerability is resolved in the official release, no additional mitigation steps are required beyond applying the update.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-07T22:40:33.820Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69dd1e0282d89c981f1b771a
Added to database: 4/13/2026, 4:46:58 PM
Last enriched: 4/21/2026, 5:58:55 AM
Last updated: 5/29/2026, 9:04:31 AM
Views: 78
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