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CVE-2026-24858: Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability

  • What: Fortinet products (FortiAnalyzer, FortiManager, FortiOS, and FortiProxy) contain an authentication bypass vulnerability.
  • Why: An attacker with a FortiCloud account and a registered device can log into other devices registered to other accounts if FortiCloud SSO authentication is enabled.
  • Affected: FortiAnalyzer, FortiManager, FortiOS, and FortiProxy.
  • Patch: Apply mitigations per vendor instructions or discontinue use of the product.
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Vendor: Fortinet Product: Multiple Products Description: Fortinet FortiAnalyzer, FortiManager, FortiOS, and FortiProxy contain an authentication bypass using an alternate path or channel that could allow an attacker with a FortiCloud account and a registered device to log into other devices registered to other accounts, if FortiCloud SSO authentication is enabled on those devices. Required Action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Due Date: 2026-01-30

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