Risk Letters

Exploited vulnerability

CVE-2026-50752

TLP:CLEAR

Improper Certificate Validation

A weakness in the certificate validation logic of the deprecated IKEv1 key exchange may allow an unauthenticated attacker positioned as a man-in-the-middle to bypass certificate validation in VPN site-to-site connections that use certificate-based authentication. Successful exploitation could allow interception or modification of traffic traversing the VPN tunnel.

Facts

  • Vendor: checkpoint
  • Product: Quantum Security Gateway
  • CVSS: 7.4
  • EPSS (probability of exploitation within 30 days): 5 %
  • First known exploitation: 16 September 2026
  • Used in ransomware campaigns (per CISA): Yes
  • First seen by Risk Letters: 8 June 2026

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

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