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CVE-2026-57517 – Unauthenticated Blind SQL Injection leading to RCE – Control Web Panel before 0….

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Summary

CVE-2026-57517 is a critical blind SQL injection vulnerability in Control Web Panel (CWP), a widely deployed Linux web hosting control panel also known as CentOS Web Panel. Affecting all versions before 0.9.8.1225, the flaw allows unauthenticated remote attackers to execute arbitrary SQL queries and escalate the attack to full Remote Code Execution (RCE) on the underlying server. With a CVSS 4.0 score of 9.3 and over 100,000 internet-facing CWP instances identified, the potential attack surface is significant and warrants immediate action.

Technical details

  • Root cause: The userRes POST parameter submitted to the CWP user endpoint is not sanitized or parameterized before being incorporated into SQL queries, enabling classic blind SQL injection without any prior authentication.
  • Trigger conditions: Any network-accessible CWP user interface (typically on port 2083) running a version prior to 0.9.8.1225 is exploitable. No credentials, special configuration, or user interaction are required.
  • Attack chain: An attacker submits a crafted HTTP POST request to the user endpoint → arbitrary SQL commands execute in the context of the MySQL process, which runs with root-level database privileges → the attacker leverages MySQL’s INTO DUMPFILE directive to write arbitrary file content to disk → a PHP webshell is placed in the web-accessible Roundcube logs directory → the attacker achieves remote code execution as the cwpsvc service account.
  • Impact: Full compromise of confidentiality, integrity, and availability of the affected server. The attack chain from initial unauthenticated HTTP request to persistent code execution on the host requires no intermediate user action and no prior foothold.

Affected software

  • Control Web Panel (CWP) — all versions before 0.9.8.1225

Severity

  • CVSS 4.0: 9.3 (Critical) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  • CVSS 3.1: 9.8 (Critical) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Update Control Web Panel to version 0.9.8.1225 or later, which contains the vendor-provided fix for this vulnerability.
  • If immediate patching is not feasible: Restrict network-level access to CWP’s administrative interfaces (ports 2087 and 2031) and user interface (port 2083) to trusted IP ranges only using firewall rules, and ensure the Roundcube logs directory is not web-accessible, to reduce the risk of exploitation until a patch can be applied.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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