by Kastro
Paper/Archive/CVE-2026-84189

CVE-2026-84189

librenms librenms — LibreNMS before 26.7.0 Stored XSS via Oxidized API

EPSS 0.4%public exploitCVSS 9.2
critical.is priorityof 100
44
CVSS 9.2 (CNA)9.2 / 10 × 3027.6Not in CISA KEV+300.0EPSS percentile 32.2.322 × 206.4Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
librenms< 26.7.026.7.0CNA

Scores by source

VulnCheck (CNA)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
VulnCheck (CNA)8.1CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

exploitgithub.com/librenms/librenms/security/advisories/GHSA-7gww-x7fh-jf9jwriteupvulncheck.com/advisories/librenms-before-26.7.0-stored-xss-via-oxidized-api