Risk Letters

Exploited vulnerability

CVE-2026-86426

TLP:CLEAR

librenms librenms Improper Authentication

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.

Facts

  • Vendor: librenms
  • Product: librenms
  • EPSS (probability of exploitation within 30 days): 4.4 %
  • First known exploitation: 28 October 2026
  • First seen by Risk Letters: 28 October 2026

Members see which Nordic sectors the flaw hits, and what to do about it.

Get the full brief

Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD