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CVE-2026-58409 ChurchCRM CVE debrief

CVE-2026-58409 is a critical vulnerability in ChurchCRM, an open-source church management system. 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. This vulnerability allows an attacker to execute arbitrary PHP code on the server, potentially leading to a complete compromise of the system.

Vendor
ChurchCRM
Product
CRM
CVSS
CRITICAL 9.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-13
Original CVE updated
2026-07-13
Advisory published
2026-07-13
Advisory updated
2026-07-13

Who should care

Administrators and users of ChurchCRM, especially those with administrative privileges, should be aware of this vulnerability and take immediate action to update to version 7.4.0 or later. Additionally, security teams and vulnerability management teams should prioritize this vulnerability due to its critical severity and potential impact on the organization.

Technical summary

The vulnerability exists in the plugin installation process, specifically in the /plugins/install-url API route (management.php). An administrator can source a malicious ZIP from any attacker-controlled HTTPS URL, validating it only against an attacker-supplied SHA-256 hash. This allows an attacker to execute arbitrary PHP code on the server. The application includes 'php' in its ALLOWED_EXTENSIONS list, which enables the execution of PHP files. The DENIED_EXTENSIONS list does not block standard .php files, further increasing the risk.

Defensive priority

High

Recommended defensive actions

  • Update ChurchCRM to version 7.4.0 or later
  • Restrict access to the plugin installation feature
  • Monitor plugin installations and updates
  • Implement additional security measures, such as web application firewalls and intrusion detection systems
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-07-13T21:16:48.450Z and has not been modified since then. The NVD entry is currently 9.1 CRITICAL. Evidence from the CVE record indicates that 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. This information is limited, and defenders should verify the affected scope and severity with the vendor.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-58409 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-58409

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-58409 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-58409

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.