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

CVE-2026-24858

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

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, 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.

CRITICAL · CVSS 9.8 ⚠ CISA KEV EPSS 0.03947
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • SSVC exploitation status: active
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬢

Required Remediation

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

⬡

Weakness Classification

CWE-288Authentication Bypass Using an Alternate Path or Channel
▤

Affected Products & Versions

20
fortinet fortianalyzer>= 7.0.0 and <= 7.0.15
fortinet fortianalyzer>= 7.2.0 and <= 7.2.11
fortinet fortianalyzer>= 7.4.0 and < 7.4.10
fortinet fortianalyzer>= 7.6.0 and < 7.6.6
fortinet fortimanager>= 7.0.0 and <= 7.0.15
fortinet fortimanager>= 7.2.0 and <= 7.2.11
fortinet fortimanager>= 7.4.0 and < 7.4.10
fortinet fortimanager>= 7.6.0 and < 7.6.6
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · psirt@fortinet.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD27 Jan 2026 · 08:16 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

7
siemens-csafSSA-975644
cisaKEV-CVE-2026-24858
cisa-csafcisa-csaf-csaf_files-OT-white-2026-icsa-26-071-02
elastic-detectionelastic-detection-rules-network-collection_fortigate_config_download
elastic-detectionelastic-detection-rules-network-defense_evasion_fortigate_overly_permissive_firewall_policy
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://fortiguard.fortinet.com/psirt/FG-IR-26-060Vendor Advisory
https://cert-portal.siemens.com/productcert/html/ssa-975644.htmlThird Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-24858US Government Resource
https://www.fortinet.com/blog/psirt-blogs/analysis-of-sso-abuse-on-fortiosMitigationVendor Advisory
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