CVE-2026-84189CWE-79cross-site-scripting

CVE-2026-84189

High · published September 1, 2026

CVSS v3.1
8.1
EPSS
0%
Percentile
31.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N
CVSS v4.0
9.2 · CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
EPSS
0.00382 · 31.0th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-09-01T16:17Z
References (3)
https://github.com/librenms/librenms/security/advisories/GHSA-7gww-x7fh-jf9j · [email protected]https://www.vulncheck.com/advisories/librenms-before-26.7.0-stored-xss-via-oxidized-api · [email protected]https://github.com/librenms/librenms/security/advisories/GHSA-7gww-x7fh-jf9j · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 03 SEP 03:32Z
    EPSS moved — → 0%
    epss
  • 01 SEP 11:33Z
    LibreNMS before 26.7.0 Stored XSS via Oxidized API
    cvelistv5