ChurchCRM up to 7.3.x Allowed Extension /plugins/install-url hash incomplete blacklist

Summaryinfo

A vulnerability was found in ChurchCRM up to 7.3.x and classified as problematic. Affected by this vulnerability is an unknown functionality of the file /plugins/install-url of the component Allowed Extension. Such manipulation of the argument hash leads to incomplete blacklist. This vulnerability is listed as CVE-2026-58409. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in ChurchCRM up to 7.3.x and classified as problematic. Affected by this issue is an unknown code of the file /plugins/install-url of the component Allowed Extension. The manipulation of the argument hash with an unknown input leads to a incomplete blacklist vulnerability. Using CWE to declare the problem leads to CWE-184. The product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are not allowed by policy or otherwise require other action to neutralize before additional processing takes place, but the list is incomplete, leading to resultant weaknesses. Impacted is confidentiality, integrity, and availability. CVE summarizes:

ChurchCRM is an open-source church management system. Prior to version 7.4.0, an authenticated administrator can achieve Remote Code Execution (RCE) on the server by installing a malicious plugin ZIP archive containing a PHP webshell. The application explicitly includes 'php' in its ALLOWED_EXTENSIONS list, while the dangerous extensions denylist (DENIED_EXTENSIONS) fails to block standard .php files. Because `php` is explicitly included in the allowed extension list for plugin archives, and extracted files are placed directly under the web root, any PHP file inside the ZIP becomes immediately executable via HTTP — without even needing to "enable" the plugin through the application UI. The /plugins/install-url API route (management.php) allows an administrator to source the malicious ZIP from any attacker-controlled HTTPS URL, validating it only against an attacker-supplied SHA-256 hash. This issue has been fixed in version 7.4.0.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-58409 since 06/30/2026. The exploitation is known to be easy. The attack may be launched remotely. Additional levels of successful authentication are necessary for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1562.006 by the MITRE ATT&CK project.

Upgrading to version 7.4.0 eliminates this vulnerability.

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Productinfo

Name

• ChurchCRM

Version

• 7.0
• 7.1
• 7.2
• 7.3

License

• open-source

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