LibreNMS up to 25.6.x ajax_form.php Type filename control

Summaryinfo

A vulnerability labeled as problematic has been found in LibreNMS up to 25.6.x. This vulnerability affects unknown code of the file ajax_form.php. Executing a manipulation of the argument Type can lead to filename control. This vulnerability is registered as CVE-2025-54138. It is possible to launch the attack remotely. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in LibreNMS up to 25.6.x. It has been declared as problematic. This vulnerability affects an unknown part of the file ajax_form.php. The manipulation of the argument type with an unknown input leads to a filename control vulnerability. The CWE definition for the vulnerability is CWE-98. The PHP application receives input from an upstream component, but it does not restrict or incorrectly restricts the input before its usage in "require," "include," or similar functions. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring which includes support for a wide range of network hardware and operating systems. LibreNMS versions 25.6.0 and below contain an architectural vulnerability in the ajax_form.php endpoint that permits Remote File Inclusion based on user-controlled POST input. The application directly uses the type parameter to dynamically include .inc.php files from the trusted path includes/html/forms/, without validation or allowlisting. This pattern introduces a latent Remote Code Execution (RCE) vector if an attacker can stage a file in this include path — for example, via symlink, development misconfiguration, or chained vulnerabilities. This is fixed in version 25.7.0.

The advisory is shared for download at github.com. This vulnerability was named CVE-2025-54138 since 07/17/2025. The exploitation appears to be difficult. The attack can be initiated remotely. There are known technical details, but no exploit is available.

By approaching the search of inurl:ajax_form.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 25.7.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch ec89714d929ef0cf2321957ed9198b0f18396c81 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-22384). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

• LibreNMS

Version

• 25.0
• 25.1
• 25.2
• 25.3
• 25.4
• 25.5
• 25.6

License

• open-source

Website

• Product: https://github.com/librenms/librenms/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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