LibreNMS up to 26.1.x Query String ajax_table.php sql injection

Summaryinfo

A vulnerability, which was classified as critical, has been found in LibreNMS up to 26.1.x. Affected by this vulnerability is an unknown functionality of the file ajax_table.php of the component Query String Handler. Performing a manipulation results in sql injection. This vulnerability is identified as CVE-2026-26988. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in LibreNMS up to 26.1.x. This affects an unknown functionality of the file ajax_table.php of the component Query String Handler. The manipulation with an unknown input leads to a sql injection vulnerability. CWE is classifying the issue as CWE-89. The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 25.12.0 and below contain an SQL Injection vulnerability in the ajax_table.php endpoint. The application fails to properly sanitize or parameterize user input when processing IPv6 address searches. Specifically, the address parameter is split into an address and a prefix, and the prefix portion is directly concatenated into the SQL query string without validation. This allows an attacker to inject arbitrary SQL commands, potentially leading to unauthorized data access or database manipulation. This issue has been fixed in version 26.2.0.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-26988 since 02/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1505 for this issue.

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

Upgrading to version 26.2.0 eliminates this vulnerability. Applying the patch 15429580baba03ed1dd377bada1bde4b7a1175a1 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.

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Productinfo

Name

• LibreNMS

Version

• 26.0
• 26.1

License

• open-source

Website

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

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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