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CVE-2026-24858

Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability

  • Critical 9.4
  • Exploited: added to CISA KEV 27 Jan 2026

Description

An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] vulnerability in Fortinet FortiAnalyzer 7.6.0 through 7.6.5, FortiAnalyzer 7.4.0 through 7.4.9, FortiAnalyzer 7.2.0 through 7.2.11, FortiAnalyzer 7.0.0 through 7.0.15, FortiManager 7.6.0 through 7.6.5, FortiManager 7.4.0 through 7.4.9, FortiManager 7.2.0 through 7.2.11, FortiManager 7.0.0 through 7.0.15, FortiNAC-F 7.6.3 through 7.6.5, FortiOS 7.6.0 through 7.6.5, FortiOS 7.4.0 through 7.4.10, FortiOS 7.2.0 through 7.2.12, FortiOS 7.0.0 through 7.0.18, FortiProxy 7.6.0 through 7.6.4, FortiProxy 7.4.0 through 7.4.12, FortiProxy 7.2.0 through 7.2.15, FortiProxy 7.0.0 through 7.0.22, FortiWeb 8.0.0 through 8.0.3, FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4.0 through 7.4.11 may 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.

Key facts

Published
27 Jan 2026
Last changed
9 Jun 2026
Assigned by
fortinet
KEV added
27 Jan 2026
KEV fix due
30 Jan 2026
EPSS
86.592% likely to be exploited in the next 30 days, higher than 99.745% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 9.4CVSS 3.1, Criticalfrom the CNA (fortinet)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C

What to do

  • Upgrade to upcoming FortiOS version 8.0.0 or above Upgrade to FortiOS version 7.6.6 or above Upgrade to FortiOS version 7.4.11 or above Upgrade to FortiOS version 7.2.13 or above Upgrade to FortiOS version 7.0.19 or above Upgrade to upcoming FortiManager version 8.0.0 or above Upgrade to FortiManager version 7.6.6 or above Upgrade to FortiManager version 7.4.10 or above Upgrade to FortiManager version 7.2.12 or above Upgrade to FortiManager version 7.0.16 or above Upgrade to FortiAnalyzer version 7.6.6 or above Upgrade to FortiAnalyzer version 7.4.10 or above Upgrade to FortiAnalyzer version 7.2.12 or above Upgrade to FortiAnalyzer version 7.0.16 or above Upgrade to FortiProxy version 7.6.5 or above Upgrade to FortiProxy version 7.4.13 or above Upgrade to FortiProxy version 7.2.16 or above Upgrade to FortiProxy version 7.0.23 or above Upgrade to FortiWeb version 8.0.4 or above Upgrade to FortiWeb version 7.6.7 or above Upgrade to FortiWeb version 7.4.12 or above Upgrade to FortiNAC-F version 7.6.6 or above Upgrade to FortiSwitchManager version 7.2.9 or above Upgrade to FortiSwitchManager version 7.0.8 or aboveCNA solution statement
  • Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
FortinetFortiWeb
  • Default status: unaffected
  • 8.0.0 up to and including 8.0.3 (affected)
  • 7.6.0 up to and including 7.6.6 (affected)
  • 7.4.0 up to and including 7.4.11 (affected)
FortinetFortiNAC-F
  • Default status: unaffected
  • 7.6.3 up to and including 7.6.5 (affected)
FortinetFortiOS
  • Default status: unaffected
  • 7.6.0 up to and including 7.6.5 (affected)
  • 7.4.0 up to and including 7.4.10 (affected)
  • 7.2.0 up to and including 7.2.12 (affected)
  • 7.0.0 up to and including 7.0.18 (affected)
FortinetFortiAnalyzer
  • Default status: unaffected
  • 7.6.0 up to and including 7.6.5 (affected)
  • 7.4.0 up to and including 7.4.9 (affected)
  • 7.2.0 up to and including 7.2.11 (affected)
  • 7.0.0 up to and including 7.0.15 (affected)
FortinetFortiProxy
  • Default status: unaffected
  • 7.6.0 up to and including 7.6.4 (affected)
  • 7.4.0 up to and including 7.4.12 (affected)
  • 7.2.0 up to and including 7.2.15 (affected)
  • 7.0.0 up to and including 7.0.22 (affected)
FortinetFortiManager
  • Default status: unaffected
  • 7.6.0 up to and including 7.6.5 (affected)
  • 7.4.0 up to and including 7.4.9 (affected)
  • 7.2.0 up to and including 7.2.11 (affected)
  • 7.0.0 up to and including 7.0.15 (affected)

Timeline

  1. 27 Jan 2026 Added to the CISA KEV catalogue
  2. 27 Jan 2026 Published

Weakness

References