Critical SEVERITY — Vulnerability

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

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.

Platform
FortiGate / FortiOS
CVE Record
CVE-2026-24858
Advisory
CISA-KEV
Published
27 January 2026
Views
3
Primary source: Review the official advisory at nvd.nist.gov Kaynağa Git

Status

This vulnerability is listed in CISA's catalog of vulnerabilities that are known to be actively exploited. Not a theoretical risk — it is being used in the wild.

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.

Advisory details

  • Vendor: Fortinet
  • Product: Multiple Products
  • Added to catalog: 2026-01-27

CISA-mandated Actions

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  • Deadline for federal agencies: 2026-01-30
Fortinet Multiple Products

FortiGate / FortiOS — Related Advisories

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