Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability
Fortinet — FortiWeb
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.
9.8
86.1%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- Jan 27, 2026
- Modified
- Jun 17, 2026
- Added to KEV
- Jan 27, 2026
- Federal patch due
- Jan 30, 2026
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.
Weakness classification
Affected packages
Proof-of-concept & exploitation references
5 foundWeaponization
Public repositories whose name or description references CVE-2026-24858, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
- absholi7ly/CVE-2026-24858-FortiCloud-SSO-Authentication-Bypass★ 9
CVE-2026-24858 FortiCloud Single Sign On (SSO) a factory default enabled feature once you register any FortiGate/FortiManager/FortiAnalyzer contains a critical authentication bypass flaw.
updated Jul 13, 2026
- gagaltotal/cve-2026-24858★ 1
CVE-2026-24858 - Administrative FortiCloud SSO authentication bypass
updated Feb 23, 2026
- m0d0ri205/CVE-2026-24858★ 0
아직 제로데이인거 같아, 공개되거나 천천히 분석할 예정....
updated Jan 29, 2026
- SimoesCTT/-CTT-NSP-Convergent-Time-Theory---Network-Stack-Projection-CVE-2026-24858-★ 0
A Proof-of-Concept demonstrating the application of 3D Navier-Stokes CTT formulations to packet flow optimization and defensive bypass.
updated Jan 30, 2026
- SimoesCTT/SCTT-2026-33-0004-FortiCloud-SSO-Identity-Singularity★ 0
While Fortinet's January 27, 2026 mitigation for **CVE-2026-24858** focuses on blocking specific accounts like `cloud-noc@mail.io`, it fails to address the **Temporal Vulnerability** of the SAML state machine.
updated Jan 31, 2026
References
Frequently asked questions
What is CVE-2026-24858?
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.
How severe is CVE-2026-24858?
CVE-2026-24858 has a CVSS base score of 9.8 out of 10 (CVSS 3.1).
Is CVE-2026-24858 actively exploited in the wild?
Yes. CVE-2026-24858 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Jan 27, 2026, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2026-24858?
86.1% - meaning FIRST.org's EPSS model estimates a 86.1% probability this vulnerability will be exploited in the wild within 30 days (100% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2026-24858?
We found 5 public GitHub repositories referencing CVE-2026-24858, though none matched a known Nuclei template or Metasploit module at last check. Review each one before relying on it - see the proof-of-concept section above.
What type of vulnerability is CVE-2026-24858?
CVE-2026-24858 is classified under CWE-288 (Improper access control).
Cross-checked against
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