CVE-2026-86426

9.2 criticalEPSS 4.4%

Critical (9.2) in librenms librenms. EPSS 4.4% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

9.2 critical

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 4.4% chance of exploitation in the next 30 days; higher than 91% of CVEs (scores of 2026-10-31)
CWE: CWE-287
Published: 2026-09-07
Modified: 2026-09-18
Record from: the NVD, synced 2026-10-19

Affected

librenms:librenms

References

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