4.6

CVSS Score

4.0

-

CVSS Score

Basic Information

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GHSA-rp7w-624x-95qv

GHSA-rp7w-624x-95qv: Duplicate Advisory: LibreNMS affected by an authenticated Cross-site Scripting vulnerability on the showconfig page

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-5gm9-622f-qcg5. This link is maintained to preserve external references.

Original Description

LibreNMS versions before 26.3.0 are affected by an authenticated Cross-site Scripting vulnerability on the showconfig page. Successful exploitation requires administrative privileges. Exploitation could result in XSS attacks being performed against other users with access to the page.

(GitHub Advisory)

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GHSA-rp7w-624x-95qv

GHSA-rp7w-624x-95qv:

4.6

CVSS Score

4.0

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
librenms/librenms	composer	< 26.3.0	26.3.0

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability is a classic authenticated cross-site scripting (XSS) issue in LibreNMS. The root cause is the failure to sanitize a user-configurable value, rancid_repo_url, before embedding it directly into an HTML anchor tag's href attribute on the showconfig page. An attacker with administrative privileges can set this configuration value to a javascript: URI. When another user (including other administrators) visits the showconfig page for a relevant device, the malicious script executes in their browser context, leading to potential session hijacking or other client-side attacks within the LibreNMS interface. The fixing commit, 82fcbdcb1b300ea47cd24d44aa4f67fe58e42d10, addresses this by wrapping the configuration value in the htmlspecialchars() function, which properly escapes the characters needed to break out of the href attribute and inject script content. A secondary hardening measure was also added to validate that the rancid_repo_url is a valid URL format upon submission.

Vulnerable functions

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Vulnerability Intelligence
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WAF Protection Rules

WAF Rule

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Reasoning

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