Fortinet
CVE-2026-24858
CRITICAL
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Fortinet FortiAnalyzer and FortiManager contain a critical authentication bypass vulnerability (CVE-2026-24858, CVSS 9.8) that allows unauthenticated remote attackers to gain administrative access through an alternate authentication path. With EPSS 2.8% but KEV listing confirming active exploitation, this vulnerability threatens the security management infrastructure that organizations rely on to protect their networks.
Technical ContextAI
The vulnerability allows attackers to bypass the standard authentication mechanism by using an alternate API path or protocol that does not properly enforce authentication requirements. FortiAnalyzer and FortiManager are centralized security management platforms that aggregate logs, manage FortiGate firewalls, and orchestrate security policies across the network. Administrative access to these platforms provides visibility into and control over the entire Fortinet security infrastructure.
RemediationAI
Apply Fortinet security update immediately. Restrict management interface access to trusted admin networks only. Review admin account activity for unauthorized access. Audit firewall policy changes for unauthorized modifications. Enable MFA for management access.
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Same technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today