LibreNMS is vulnerable to Reflected-XSS in `report_this` function
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:.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | librenms/librenms | < 25.7.0 | 25.7.0 |
References
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P- Weakness (CWE)
CWE-79- Platform
- Composer
- Package
librenms/librenms- Disclosed
- 13.10.2025
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-86rg-8hc8-v82p - CC BY 4.0
Vulnerability history: librenms/librenms
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 106
- First → latest
- 10.2019 08.2026
- Without a fix
- 6
- Exploited in attacks
- 0
Severity breakdown
- Critical 5
- High 39
- Medium 56
- Low 6
Disclosures per year
- 2019: 6
- 2020: 0
- 2021: 7
- 2022: 26
- 2023: 12
- 2024: 24
- 2025: 15
- 2026: 16
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LibreNMS is vulnerable to Reflected-XSS in `report_this` function this entry
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