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VulnerabilitiesNov 11, 2026

Critical Fortinet Flaws Expose FortiManager and FortiAnalyzer to Remote Code Execution Without Login

Fortinet disclosed critical vulnerabilities in FortiManager, FortiAnalyzer, and FortiOS, allowing RCE without login.

Fortinet has disclosed critical security flaws affecting FortiManager, FortiAnalyzer, and FortiOS, with some allowing unauthenticated remote code execution. The highest-rated issue, CVE-2026-126170 (CVSS 9.8), involves JSON injection in the JSON-RPC API, enabling code execution when the API is enabled. Other critical flaws include an authorization weakness in FortiManager's FGFM service (CVE-2026-126261) and SQL injection via OFTP (CVE-2026-126262) affecting FortiAnalyzer and FortiManager. Fortinet has released updates to address these vulnerabilities.

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The lesson from this incident

Full lesson

Multiple critical vulnerabilities in Fortinet's FortiManager and FortiAnalyzer platforms—including a CVSS 9.8 JSON injection flaw enabling unauthenticated remote code execution—expose core network management infrastructure to full compromise without requiring any login credentials. The root cause lies in insufficient input validation and authorization enforcement within exposed APIs and services, compounding risk when these management interfaces are reachable from untrusted networks. Because FortiManager and FortiAnalyzer sit at the heart of enterprise network operations, a successful exploit could grant attackers administrative control over the entire managed environment. Fortinet has released patches, but organizations that delay updates or leave management APIs unnecessarily exposed remain critically vulnerable. This incident underscores that network security appliances must themselves be treated as high-value attack surfaces requiring rigorous patch discipline and access controls.

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Indicators of Compromise

Extracted by AI from the linked source. Not reviewed by an editor. How this works

  • cve — CVE-2026-126170
  • cve — CVE-2026-126261
  • cve — CVE-2026-126262
  • cve — CVE-2026-126260
  • cve — CVE-2026-126254
  • cve — CVE-2026-126253
  • cve — CVE-2026-126229
  • cve — CVE-2026-126259

Entities

Fortinet (vendor)FortiManager (product)FortiAnalyzer (product)FortiOS (product)