EUVD-2026-19726Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4DescriptionGitHub Advisory
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.
AnalysisAI
Open redirect vulnerability in ChurchCRM prior to version 7.0.0 allows authenticated users to be redirected to arbitrary URLs via crafted links containing unvalidated redirect parameters, particularly through the 'linkBack' parameter used across multiple application pages including DonatedItemEditor.php. An attacker can create a malicious link that redirects authenticated users to external sites when they interact with UI elements, enabling phishing attacks and credential theft. The vulnerability requires an authenticated user and user interaction (clicking a button), reducing immediate risk but posing moderate concern in social engineering scenarios.
Technical ContextAI
This is a CWE-601 open redirect vulnerability, a common weakness where user-controlled input is used to construct redirect URLs without proper validation or allowlisting. The vulnerability exists in PHP-based ChurchCRM, specifically in how the 'linkBack' parameter is processed across multiple pages. The parameter is used to return users to their previous location but fails to validate that the redirect destination is within the application's domain, allowing attackers to inject arbitrary URLs. This class of vulnerability is particularly dangerous in web applications managing sensitive organizational data, as redirects can be chained with phishing pages to harvest credentials from authenticated users.
RemediationAI
Upgrade to ChurchCRM version 7.0.0 or later, which contains the fix for the open redirect vulnerability. The patch validates redirect destinations and restricts 'linkBack' parameters to internal application URLs. For organizations unable to immediately upgrade, implement a Web Application Firewall (WAF) rule to block redirect parameters pointing to external domains. Additionally, review and sanitize all uses of the 'linkBack' parameter across the codebase to ensure they are validated against a whitelist of internal URLs. See the official security advisory at https://github.com/ChurchCRM/CRM/security/advisories/GHSA-v3hj-33xf-qx47 for additional context.
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