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CVE-2026-86426

9.8 CRITICALPublic exploitEPSS 1.41%
  1. Published7 Sept 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Librenms Librenms< 26.8.0

Remediation

Fixed in
Librenms Librenms≥ 26.8.0

References

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Frequently asked

Is CVE-2026-86426 being actively exploited?

CVE-2026-86426 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.41%.

How severe is CVE-2026-86426?

CVE-2026-86426 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 1.41% probability of exploitation.

Which products are affected by CVE-2026-86426?

Affected products include Librenms Librenms.

How do I fix CVE-2026-86426?

Upgrade affected software to a fixed version, for example Librenms Librenms 26.8.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-86426 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.