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Zero-dayApr 6, 2026

Fortinet Issues Emergency Patch for FortiClient Zero-Day

Fortinet releases emergency patch for FortiClient authentication bypass zero-day CVE-2026-35616.

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Summary

Fortinet has issued an emergency patch for CVE-2026-35616, an authentication bypass vulnerability in FortiClient that has been actively exploited in the wild. This zero-day represents the latest in a growing series of Fortinet vulnerabilities targeted by threat actors. Organizations running affected FortiClient versions should prioritize patching immediately.

Indicators of Compromise

  • cve — CVE-2026-35616

Entities

Fortinet (vendor)FortiClient (product)