CVE-2026-39327: ChurchCRM SQL Injection Vulnerability

CVE-2026-39327 Overview

CVE-2026-39327 is a SQL injection vulnerability discovered in ChurchCRM, an open-source church management system. Prior to version 7.1.0, the /MemberRoleChange.php endpoint in ChurchCRM 7.0.5 is vulnerable to SQL injection attacks. Authenticated users with the "Manage Groups & Roles" (ManageGroups) permission can inject arbitrary SQL statements through the NewRole parameter, allowing them to extract and modify sensitive information stored in the database.

Critical Impact

Authenticated attackers can leverage this SQL injection vulnerability to extract sensitive church member data, modify database records, and potentially compromise the entire ChurchCRM installation.

Affected Products

• ChurchCRM versions prior to 7.1.0
• ChurchCRM 7.0.5 (confirmed vulnerable)
• Any ChurchCRM installation with users having ManageGroups role permissions

Discovery Timeline

• 2026-04-07 - CVE-2026-39327 published to NVD
• 2026-04-08 - Last updated in NVD database

Technical Details for CVE-2026-39327

Vulnerability Analysis

This vulnerability represents a classic SQL injection flaw (CWE-89) where user-supplied input is incorporated into SQL queries without proper sanitization or parameterization. The vulnerable endpoint /MemberRoleChange.php accepts a NewRole parameter that is used directly in database operations. When an authenticated user with the ManageGroups role submits a crafted request, the malicious SQL payload is executed against the backend database with the privileges of the application's database user.

The attack requires authentication and specific role assignment, which provides some barrier to exploitation. However, in church management systems where multiple volunteers may have administrative access, this requirement is less restrictive than it might initially appear. Once exploited, an attacker gains the ability to read arbitrary data from the database—including personal information about church members, financial records, and administrative credentials—as well as modify or delete existing records.

Root Cause

The root cause of this vulnerability is improper input validation and the use of dynamic SQL query construction without parameterized queries or prepared statements. The NewRole parameter value is concatenated directly into SQL statements rather than being passed as a bound parameter, allowing attackers to break out of the intended query structure and inject their own SQL commands.

Attack Vector

The attack is conducted over the network against authenticated sessions. An attacker must first obtain valid credentials for an account with the ManageGroups role. Once authenticated, they can craft malicious HTTP requests to the /MemberRoleChange.php endpoint, embedding SQL injection payloads within the NewRole parameter. The injected SQL executes in the context of the web application's database connection, typically with full read/write access to the ChurchCRM database.

The vulnerability allows for both data extraction (using UNION-based or blind SQL injection techniques) and data manipulation (INSERT, UPDATE, DELETE operations). Depending on the database configuration and privileges, it may also be possible to escalate the attack to achieve command execution on the underlying server.

Detection Methods for CVE-2026-39327

Indicators of Compromise

• Unusual HTTP requests to /MemberRoleChange.php containing SQL syntax characters such as single quotes, double dashes, or UNION keywords in the NewRole parameter
• Database error messages in application logs indicating malformed SQL queries
• Unexpected modifications to user roles or group memberships in the ChurchCRM database
• Evidence of data exfiltration through abnormally large response sizes from the vulnerable endpoint

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block SQL injection patterns in requests to /MemberRoleChange.php
• Monitor application logs for SQL error messages that may indicate injection attempts
• Review audit logs for suspicious role change activities, especially bulk or rapid modifications
• Deploy database activity monitoring to detect anomalous query patterns

Monitoring Recommendations

• Enable detailed logging for the /MemberRoleChange.php endpoint and review logs regularly
• Set up alerts for HTTP requests containing common SQL injection signatures targeting ChurchCRM endpoints
• Monitor database query logs for unusual SELECT, UNION, or data modification statements originating from the web application
• Implement user behavior analytics to detect accounts exhibiting abnormal administrative activity

How to Mitigate CVE-2026-39327

Immediate Actions Required

• Upgrade ChurchCRM to version 7.1.0 or later immediately
• Review user accounts with ManageGroups role and restrict access to only essential personnel
• Audit database logs for any evidence of exploitation prior to patching
• Consider implementing a web application firewall to provide additional protection while patching is scheduled

Patch Information

ChurchCRM has addressed this vulnerability in version 7.1.0. Organizations running affected versions should upgrade to 7.1.0 or later as soon as possible. The fix implements proper input sanitization and parameterized queries for the vulnerable endpoint. For detailed information about the security fix, refer to the GitHub Security Advisory.

Workarounds

• Temporarily disable or restrict access to the /MemberRoleChange.php endpoint if immediate patching is not possible
• Remove the ManageGroups role from all non-essential user accounts until the patch is applied
• Deploy a reverse proxy or WAF rule to block requests containing SQL injection patterns to the vulnerable endpoint
• Implement network segmentation to limit database access from the web application server

# Example: Apache mod_rewrite rule to block access to vulnerable endpoint
# Add to .htaccess or Apache configuration as a temporary measure
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/MemberRoleChange\.php [NC]
RewriteRule .* - [F,L]