CVE-2026-15937

Improper certificate validation in Checkmk <2.5.0p10 allows a relay and a push agent that share the same UUID to reuse each other's mTLS certificate to authenticate against agent receiver endpoints in either direction, because the endpoints do not verify that the certificate was issued by their own root certificate.

  • Published Sep 4, 2026
  • CVSS 5.3 medium
  • 0.1% chance of exploitation in the next 30 days (EPSS)

Affected software

CVE-2026-15937 at the National Vulnerability Database