CVE-2026-57517 Overview
CVE-2026-57517 is a blind SQL injection vulnerability affecting Control Web Panel (CWP) versions before 0.9.8.1225. The flaw resides in the userRes POST parameter of the user endpoint, where unsanitized input reaches the underlying MySQL database. Unauthenticated remote attackers can execute arbitrary SQL queries against the backend. Because CWP connects to MySQL with root privileges, attackers can escalate the injection into remote code execution by writing a PHP webshell to the roundcube logs directory using INTO DUMPFILE. Successful exploitation yields code execution as the cwpsvc account. The vulnerability is categorized under [CWE-89].
Critical Impact
Unauthenticated attackers can achieve remote code execution on affected CWP servers by chaining SQL injection with MySQL file write primitives.
Affected Products
- Control Web Panel (CWP) versions prior to 0.9.8.1225
- Deployments exposing the CWP user endpoint to untrusted networks
- Installations running MySQL with root privileges assigned to the CWP database user
Discovery Timeline
- 2026-07-01 - CVE-2026-57517 published to NVD
- 2026-07-01 - Last updated in NVD database
Technical Details for CVE-2026-57517
Vulnerability Analysis
The vulnerability originates in the user endpoint of Control Web Panel, which accepts a userRes parameter via HTTP POST. Input from this parameter flows directly into a SQL query without parameterization or sanitization. Attackers submit crafted payloads that alter the query's logic and extract data through blind boolean or time-based techniques.
Because the application connects to MySQL as root, an attacker is not limited to reading data. The FILE privilege granted to root permits writing query results to arbitrary paths on disk using SELECT ... INTO DUMPFILE. Attackers stage a PHP payload as the query output and target the roundcube logs directory, which is served by the CWP web stack.
Once the webshell is written, requesting the file executes attacker-supplied PHP code under the cwpsvc service account. This account owns core panel processes, giving attackers control over hosting configurations, tenant data, and further lateral movement paths. See the KarmaInSecurity Advisory KIS-2026-12 and the VulnCheck SQL Injection Advisory for technical details.
Root Cause
The root cause is missing input validation and the use of dynamic SQL string concatenation for the userRes parameter. The database account also holds excessive privileges, allowing the SQL injection to be weaponized into a file write primitive.
Attack Vector
Exploitation requires only network access to the CWP web interface. No authentication, user interaction, or prior foothold is needed. The attacker sends a single HTTP POST request to the user endpoint with a malicious userRes value, then requests the dropped PHP file under the roundcube logs path to trigger execution.
No verified public exploit code is referenced in the enriched data. Refer to the Control Web Panel Changelog for the fixed version.
Detection Methods for CVE-2026-57517
Indicators of Compromise
- POST requests to the CWP user endpoint containing SQL metacharacters or INTO DUMPFILE fragments in the userRes parameter.
- Unexpected .php files written under the roundcube logs directory or other web-accessible paths owned by cwpsvc.
- New MySQL query patterns from the CWP database user referencing SELECT ... INTO DUMPFILE or INTO OUTFILE.
- Outbound network connections initiated by cwpsvc or PHP worker processes to unfamiliar hosts.
Detection Strategies
- Inspect web server access logs for POST requests to /user with anomalous userRes values and time-based delays consistent with blind SQLi.
- Enable MySQL general query logging on CWP hosts and alert on DUMPFILE or OUTFILE statements originating from the panel database user.
- Monitor filesystem changes under roundcube log directories and CWP web roots using integrity monitoring tools.
Monitoring Recommendations
- Baseline the process lineage of cwpsvc and flag PHP interpreter executions spawning shells, curl, wget, or reverse-shell primitives.
- Forward CWP web access logs and MySQL audit logs to a centralized analytics platform for correlation and retention.
- Alert on newly created files with executable extensions inside directories designed to store log or cache data.
How to Mitigate CVE-2026-57517
Immediate Actions Required
- Upgrade Control Web Panel to version 0.9.8.1225 or later immediately using the vendor's update procedure.
- Restrict network access to the CWP administrative interface using firewalls or VPN gating until patching is complete.
- Review the roundcube logs directory and CWP web roots for unauthorized .php files and remove any confirmed webshells.
- Rotate credentials, API tokens, and SSH keys stored on affected servers, since attacker code executed as cwpsvc may have accessed them.
Patch Information
Control Web Panel addressed the vulnerability in release 0.9.8.1225. The fix is documented in the Control Web Panel Changelog. Administrators should verify the installed version after updating and confirm that the panel restarts cleanly.
Workarounds
- Block external access to the CWP user endpoint at the reverse proxy or web application firewall layer until the patch is applied.
- Reduce MySQL privileges for the CWP database user by revoking the FILE privilege, which blocks the INTO DUMPFILE escalation path.
- Set secure_file_priv in the MySQL configuration to a non-writable path to prevent arbitrary file writes from SQL statements.
# Configuration example: restrict MySQL file writes on CWP hosts
# /etc/my.cnf
[mysqld]
secure_file_priv=/var/empty
# Revoke FILE privilege from the CWP database user
mysql -u root -p -e "REVOKE FILE ON *.* FROM 'cwp'@'localhost'; FLUSH PRIVILEGES;"
# Restart MySQL to apply configuration changes
systemctl restart mysqld
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
