Vulnerability · Published Sep 1, 2026 · Assigned by VulnCheck

CVE-2026-84189LibreNMS before 26.7.0 Stored XSS via Oxidized API

High 8.1

In plain English

A high-severity cross-site scripting in librenms from librenms. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)0.4%top 67.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

LibreNMS through 26.4.0 renders JSON fields (name, ip, model, author, commit message) returned by the admin-configurable Oxidized integration URL (oxidized.url) into the device showconfig page without applying htmlspecialchars(). An administrator who points the Oxidized URL at an attacker-controlled server (SSRF) can cause it to return malicious JSON, resulting in stored/persistent cross-site scripting affecting all users who view any device's showconfig tab. Fixed in 26.7.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	librenms/librenms	26.7.0	GHSA-7gww-x7fh-jf9j

Affected products (as reported)

Vendor	Product	Versions
librenms	librenms	0 – before 26.7.0

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N

References

GitHub Security Advisory (GHSA-7gww-x7fh-jf9j) vendor-advisory
VulnCheck Advisory: LibreNMS before 26.7.0 Stored XSS via Oxidized API third-party-advisory