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CVE

CVE-2026-86426

LibreNMS before 26.8.0 Authentication Bypass via API Token Type Confusion
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CVE

CVE-2026-86426

LibreNMS before 26.8.0 Authentication Bypass via API Token Type Confusion

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.

Package Versions Affected

Package Version
patch Availability
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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.2
-
4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86426.json, https://github.com/librenms/librenms/security/advisories/GHSA-cvq8-gqfq-3mvg, https://nvd.nist.gov/vuln/detail/CVE-2026-86426, https://www.vulncheck.com/advisories/librenms-before-26.8.0-authentication-bypass-via-api-token-type-confusion

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.0387%
EPSS Percentile
0.89925%
Introduced Version
0
Fix Available
d2b6e2557b637a606612959e6007150c3726fb43

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