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GHSA-86rg-8hc8-v82pmedium5.5

LibreNMS is vulnerable to Reflected-XSS in `report_this` function

Impact

Reflected-XSS in report_this function in librenms/includes/functions.php

Source excerpt · OSV

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

librenms/librenms Packagist
Affected rangeRecorded fix
Earlier releases before 25.7.0Ecosystem versions25.7.0

Version evidence: OSV · GHSA-86rg-8hc8-v82p

View original version evidence (140 explicit versions)

Original source description

Summary

Reflected-XSS in report_this function in librenms/includes/functions.php

Details

Recently, it was discovered that the report_this function had improper filtering (htmlentities function was incorrectly used in a href environment), which caused the project_issues parameter to trigger an XSS vulnerability.

The Vulnerable Sink: https://github.com/librenms/librenms/blob/master/includes/functions.php#L444

PoC

GET project_issues=javascript:alert(document.cookie)

Impact

XSS vulnerabilities allow attackers to execute malicious scripts in users' browsers, enabling unauthorized access to sensitive data, session hijacking, or malware distribution.

Suggestion

It is recommended to filter dangerous protocols, e.g. javascript:/file:.

References