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CVE-2026-86426: Product identification pending

Severity

9.2 (CRITICAL)

Vendor

LIBRENMS BEFORE

Affected versions

Before 26.8.0

Fixed version

26.8.0

Patch status

Patched

Published

2026-09-07T13:20:41.690

Modified

2026-09-07T13:20:41.690

Why it matters

This matters because the issue affects identity or token handling. Successful exploitation could allow unauthorized authentication, client manipulation, or access to protected services.

Recommended admin actions

• Prioritize validation immediately due to critical CVSS severity.
• Compare installed versions against the affected version range in the advisory.
• Treat internet-facing systems as higher priority.
• Review logs for suspicious activity related to the affected application or component.

Technical summary

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.

View the official NVD record for CVE-2026-86426

CVE data is sourced from NVD/CNA records and optional enrichment. Validate against the vendor advisory before taking production action.