CVE-2026-85102: critical vulnerability in checkpoint Quantum Security Gateway
Improper Certificate Validation in Quantum Security Gateway
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
Prioritize patching. It under exploitation confirmed by CISA, has an official Brazilian government alert and has a public proof of concept.
Brazil's federal government published an alert, recommendation or bulletin that cites this vulnerability.
- CTIR Gov · ALERTA 91/2026 · 01 Oct 2026Vulnerabilidade crítica que afeta produtos Checkpoint - Quantum Security Gatewayread on gov.br ↗
- CISC Gov.br · 24 Sep 2026Boletim do CISC de Vulnerabilidadesread on gov.br ↗
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
The Quantum Security Gateway doesn't properly verify VPN certificates, allowing an attacker to impersonate a legitimate server and inject malicious code without needing valid credentials.
CWE-295 improperly validates X.509 certificates during VPN negotiation, enabling unauthenticated remote code execution. An attacker can perform a man-in-the-middle attack by presenting a forged certificate and execute arbitrary code with gateway privileges when validation is bypassed.
In the same product, most dangerous first.