Stored Cross-Site Scripting Vulnerability in LibreNMS by LibreNMS
CVE-2026-84188

4.8MEDIUM

Key Information:

Vendor

Librenms

Status
Librenms
Vendor
CVE Published:
1 September 2026

What is CVE-2026-84188?

LibreNMS versions up to 26.4.0 are susceptible to a stored cross-site scripting (XSS) vulnerability. This flaw exists in the graph_descr. configuration settings, where malicious HTML payloads can be stored without proper HTML escaping. As a consequence, any authenticated user viewing the affected graph types may have the payload executed in their browser, potentially leading to unauthorized actions or data exposure. The issue has been rectified in version 26.7.0, and it is strongly recommended for users to upgrade to this version to mitigate the risk.

Affected Version(s)

librenms 0 < 26.7.0

librenms 26.7.0

References

https://github.com/librenms/librenms/security/advisories/...
vendor-advisory
https://www.vulncheck.com/advisories/librenms-before-26.7...
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

k1bana
.