What’s Vulnerable › Vulnerabilities

CVE-2026-39940: ChurchCRM has an Open Redirect via the ‘linkBack’ URL Parameter in DonatedItemEditor.php

• Severity: medium (CVSS 5.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-13 · updated 2026-10-26
• Weakness: CWE-601

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.

Affected products

• ChurchCRM CRM: before 7.0.0

References

• https://github.com/ChurchCRM/CRM/security/advisories/GHSA-5g52-rvjf-6wwf
• https://github.com/ChurchCRM/CRM/security/advisories/GHSA-v3hj-33xf-qx47

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