CVE-2026-84189

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.

CVSS 4.0

9.2CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N

CVSS 3.1

8.1CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N

EPSS

0.4% chance of exploitation in the next 30 days; higher than 31% of CVEs (scores of 2026-10-25)

CWE

CWE-79

Published

2026-09-01

Modified

2026-10-08

Record from

the NVD, synced 2026-10-19

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

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