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

CVE-2025-62365 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

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:.

Basic information

Type
reviewed
Severity
medium
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2025-10-13 22:11:25 UTC
Updated
2025-10-14 00:55:39 UTC
GitHub reviewed
2025-10-13 22:11:25 UTC
NVD published
2025-10-13

EPSS Score

Score Percentile
0.00% 0.03%

CVSS Scores

Base score Version Severity Vector
5.5 4.0 —
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 Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network.
Attack complexity (AC:L)
Exploitation conditions are straightforward and stable.
Attack requirements (AT:N)
No additional preconditions are required beyond normal reachability.
Privileges required (PR:N)
No privileges are required.
User interaction (UI:N)
No user interaction is required.
Vulnerable system confidentiality impact (VC:N)
No confidentiality impact on the vulnerable system.
Vulnerable system integrity impact (VI:N)
No integrity impact on the vulnerable system.
Vulnerable system availability impact (VA:N)
No availability impact on the vulnerable system.
Subsequent system confidentiality impact (SC:L)
Limited confidentiality impact on subsequent systems.
Subsequent system integrity impact (SI:L)
Limited integrity impact on subsequent systems.
Subsequent system availability impact (SA:N)
No availability impact on subsequent systems.
Exploit maturity (threat) (E:P)
Proof-of-concept: public PoC exists; no reported exploitation and no known simplification tools.

Identifiers

Type Value
GHSA GHSA-86rg-8hc8-v82p ↗
CVE CVE-2025-62365 ↗

CWEs

CWE id Name
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Credits

  • GatekeeperBuster (reporter)

Affected packages (1)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
composer librenms/librenms <= 25.6.0 25.7.0 —

References

cvelogic Threat Intelligence