CVE-2026-86426

UNKNOWN 0.0

LibreNMS before 26.8.0 Authentication Bypass via API Token Type Confusion

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-287
Vendor	librenms
Product	librenms
Published	Sep 7, 2026
Last Updated	Sep 8, 2026

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Affected Versions

librenms / librenms

0 < 26.8.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

🔍 rbs-astsec