CVE-2025-62411: librenms XSS — Exploit & Fix

Description

LibreNMS is a community-based GPL-licensed network monitoring system. LibreNMS <= 25.8.0 contains a Stored Cross-Site Scripting (XSS) vulnerability in the Alert Transports management functionality. When an administrator creates a new Alert Transport, the value of the Transport name field is stored and later rendered in the Transports column of the Alert Rules page without proper input validation or output encoding. This leads to arbitrary JavaScript execution in the admin’s browser. This vulnerability is fixed in 25.10.0.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
librenms	librenms	< 25.10.0

References

Advisories & Patches

https://github.com/librenms/librenms/commit/706a77085f4d5964f7de9444208ef707e1f79450 https://github.com/librenms/librenms/security/advisories/GHSA-frc6-pwgr-c28w https://github.com/librenms/librenms/security/advisories/GHSA-frc6-pwgr-c28w

Exploits

https://github.com/librenms/librenms/security/advisories/GHSA-frc6-pwgr-c28w https://github.com/librenms/librenms/security/advisories/GHSA-frc6-pwgr-c28w

Frequently Asked Questions

What is CVE-2025-62411? +

LibreNMS is a community-based GPL-licensed network monitoring system. LibreNMS <= 25.8.0 contains a Stored Cross-Site Scripting (XSS) vulnerability in the Alert Transports management functionality. When an administrator creates a new Alert Transport, the value of the Transport name field is stored and later rendered in the Transports column of the Alert Rules page without proper input validation or output encoding. This leads to arbitrary JavaScript execution in the admin’s browser. This vulnerability is fixed in 25.10.0. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-62411? +

CVE-2025-62411 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-62411? +

CVE-2025-62411 affects products from librenms, specifically: librenms. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-62411? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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