Stored Cross-Site Scripting in LibreNMS by The LibreNMS Project
CVE-2026-84193

5.8MEDIUM

Key Information:

Vendor

Librenms

Status
Librenms
Vendor
CVE Published:
1 September 2026

What is CVE-2026-84193?

LibreNMS versions up to 26.2.0 are prone to a stored cross-site scripting vulnerability stemming from unescaped SNMP data fields within legacy PHP template pages. This vulnerability allows attackers with management or network access to inject malicious JavaScript code when administrators view certain routing and device pages. The exploitation could lead to serious implications, including the unauthorized theft of credentials and the exfiltration of CSRF tokens. To mitigate risks, users are advised to upgrade to the latest version of LibreNMS and follow security best practices.

Affected Version(s)

librenms 0 <= 26.2.0

References

https://github.com/librenms/librenms/security/advisories/...
vendor-advisory
https://www.vulncheck.com/advisories/librenms-through-26....
third-party-advisory

CVSS V4

Score:
5.8
Severity:
MEDIUM
Confidentiality:
High
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

dimashn04
.