CVE-2026-9302: VPS Inventory Monitoring RCE Vulnerability

CVE-2026-9302 Overview

CVE-2026-9302 is a code injection vulnerability in the vps-inventory-monitoring project maintained by GitHub user 546669204. The flaw resides in the eval function of app/index/command/VpsTest.php within the VpsTest Console component. Attackers can manipulate the vf argument to inject and execute arbitrary code remotely. The exploit has been publicly disclosed, increasing the likelihood of opportunistic exploitation. The project uses a rolling release model, so no fixed version identifier is available for affected or patched builds. According to the disclosure, the maintainer was notified through an issue report but has not responded.

Critical Impact
Remote attackers with low-level privileges can inject PHP code through the vf parameter, leading to arbitrary code execution in the application context.

Affected Products

546669204/vps-inventory-monitoring repository through commit 98c00b370668c96ae75e91c15548d9ea113652d9
VpsTest Console component (app/index/command/VpsTest.php)
All rolling release builds prior to a maintainer response or fix

Discovery Timeline

2026-05-23 - CVE-2026-9302 published to NVD
2026-05-26 - Last updated in NVD database

Technical Details for CVE-2026-9302

Vulnerability Analysis

The vulnerability is classified under [CWE-74] (Improper Neutralization of Special Elements in Output Used by a Downstream Component) and manifests as a code injection issue. The affected function eval in app/index/command/VpsTest.php accepts user-controlled input through the vf argument without sanitization. PHP's eval construct interprets any supplied string as executable code, which makes unfiltered input a direct path to arbitrary code execution. Because the entry point is reachable over the network and only requires low privileges, an authenticated user can trigger the flaw without complex preconditions. Public disclosure on the GitHub CVE issue tracker and VulDB Vulnerability #365249 raises exposure for any deployed instance.

Root Cause

The root cause is the direct passing of attacker-influenced data into the PHP eval function inside the VpsTest Console handler. The code path does not validate, sanitize, or restrict the vf argument before evaluation. Combined with the project's rolling release model, downstream operators have no clear version boundary to identify a safe build.

Attack Vector

An attacker submits a crafted request containing a malicious payload in the vf parameter to the VpsTest Console endpoint. The application interprets the payload as PHP code through eval, executing it in the web server process context. See the VulDB CTI Information and the GitHub issue report for additional disclosure details.

Detection Methods for CVE-2026-9302

Indicators of Compromise

HTTP requests targeting the VpsTest Console endpoint containing PHP syntax in the vf parameter (for example system(, exec(, passthru(, base64_decode().
Unexpected child processes spawned by the PHP-FPM or web server worker after requests to app/index/command/VpsTest.php.
Outbound connections from the web server to unfamiliar hosts following access to the VpsTest Console route.

Detection Strategies

Inspect web server access logs for requests to the VpsTest Console with suspicious or encoded values in the vf argument.
Apply web application firewall rules that block PHP function names and metacharacters in query string and POST parameters.
Correlate process creation telemetry from the web host with HTTP request logs to identify command execution chains originating from the PHP runtime.

Monitoring Recommendations

Enable PHP audit logging or extensions such as Snuffleupagus to record eval invocations and their input.
Monitor file integrity on the application directory to detect webshell drops or modification of VpsTest.php.
Alert on anomalous outbound traffic from servers hosting vps-inventory-monitoring deployments.

How to Mitigate CVE-2026-9302

Immediate Actions Required

Restrict network access to the VpsTest Console endpoint using firewall or reverse proxy ACLs until a fix is available.
Revoke or rotate credentials for any low-privilege accounts that can reach the affected route.
Audit the vps-inventory-monitoring deployment for signs of prior exploitation, including new files in the web root.

Patch Information

No vendor patch is available. The maintainer of 546669204/vps-inventory-monitoring has not responded to the issue report referenced in the GitHub Issue Tracker. Operators should track the upstream GitHub Project Repository for updates and consider forking the project to apply a local fix that removes the eval call or replaces it with a safe dispatcher.

Workarounds

Remove or comment out the vulnerable eval invocation in app/index/command/VpsTest.php and replace it with an allowlist of supported commands.
Place the application behind authentication and IP allowlisting so the VpsTest Console is unreachable from untrusted networks.
Deploy WAF signatures that block PHP function tokens, backticks, and serialized payloads in the vf parameter.

bash

# Example nginx restriction blocking external access to the VpsTest Console
location ~* /app/index/command/VpsTest\.php$ {
    allow 10.0.0.0/8;
    deny all;
}