IRONSMITHINTEL
CRITICALCVSS9.8
|
Actively Exploited
|CISA KEV|CVE-2026-24858|Auth: none — unauthenticated|Reboot: required|Manual only

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.

Published Jan 27, 2026 · Updated May 16, 2026
Why patchRisk explained in plain English
Worst-case scenarioIf unpatched

A remote attacker, without authentication, can achieve full data confidentiality loss, arbitrary modification of data, complete denial of service or system unavailability. Federal agencies are required to remediate by 2026-01-30 under CISA BOD 22-01.

How the attack worksNo clicks needed

This is a Authentication Bypass (CWE-288) vulnerability in Fortinet Multiple Products. 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. Exploitation requires remote network access, low attack complexity, no authentication required, and no user interaction required.

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Phishing link

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Malicious file

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Server compromised

Am I affected?Quick check

Probably yes if any of these apply:

●Network Security Team
●Firewall Administrators
●IT Security
●Running fortianalyzer: 7.0.0 ≤ v ≤ 7.0.15, 7.2.0 ≤ v ≤ 7.2.11, 7.4.0 ≤ v < 7.4.10, 7.6.0 ≤ v < 7.6.6; fortimanager: 7.0.0 ≤ v ≤ 7.0.15, 7.2.0 ≤ v ≤ 7.2.11, 7.4.0 ≤ v < 7.4.10, 7.6.0 ≤ v < 7.6.6; fortiproxy: 7.0.0 ≤ v ≤ 7.0.22, 7.2.0 ≤ v ≤ 7.2.15, 7.4.0 ≤ v ≤ 7.4.12, 7.6.0 ≤ v ≤ 7.6.4; fortiweb: 7.4.0 ≤ v ≤ 7.4.11, 7.6.0 ≤ v ≤ 7.6.6, 8.0.0 ≤ v ≤ 8.0.3; fortios: 7.0.0 ≤ v ≤ 7.0.18, 7.2.0 ≤ v ≤ 7.2.12, 7.4.0 ≤ v < 7.4.11, 7.6.0 ≤ v < 7.6.6; ruggedcom ape1808 firmware: -
Real-world incidentsWhat we've seen

CISA added this CVE to the Known Exploited Vulnerabilities catalog on 2026-01-27 based on evidence of active exploitation in the wild. Federal agencies required to remediate by 2026-01-30.

How to patch

Manual remediation steps

Apply the Vendor Patch

This vulnerability is in the CISA Known Exploited Vulnerabilities catalog — apply the vendor's security update as soon as possible.

CISA 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.

References

    1
    Vendor advisory: https://www.fortinet.com/blog/psirt-blogs/analysis-of-sso-abuse-on-fortios
    1
    NVD entry: https://nvd.nist.gov/vuln/detail/CVE-2026-24858
    1
    CISA KEV: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-24858
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References

↗ CVE-2026-24858↗ NVD↗ Vendor Advisory