CVE-2026-86426

Critical · CVSS 9.8

CVSS: 9.8; nvd
EPSS: —
KEV: No
Class: oss containerizable; CWE-287

Description

LibreNMS before 26.8.0 contains an authentication bypass vulnerability in the REST API that allows unauthenticated attackers to access protected endpoints by sending numeric values instead of string tokens. Attackers can exploit MySQL type coercion by sending small integers like 0 through 9 to match token hashes, gaining access to API functionality including device credentials and administrative features that enable remote code execution through alert templates.

References

https://github.com/librenms/librenms/security/advisories/GHSA-cvq8-gqfq-3mvg
https://www.vulncheck.com/advisories/librenms-before-26.8.0-authentication-bypass-via-api-token-type-confusion
https://github.com/librenms/librenms/security/advisories/GHSA-cvq8-gqfq-3mvg

Status: profiled · ingested 2026-09-08T18:00:58.000Z