What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-01 · updated 2026-10-08
• Weakness: CWE-79

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 products

• librenms: before 26.7.0 — fixed in 26.7.0

How to fix

Upgrade to a fixed version: librenms 26.7.0. Check the vendor advisory for mitigations.

References

• https://github.com/librenms/librenms/security/advisories/GHSA-7gww-x7fh-jf9j
• https://www.vulncheck.com/advisories/librenms-before-26.7.0-stored-xss-via-oxidized-api
• https://github.com/librenms/librenms/security/advisories/GHSA-7gww-x7fh-jf9j

Get alerted when CVE-2026-84189 or the next vulnerability affects your stack