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CVE-2026-24858: Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability

criticalknown exploitedCVE-2026-24858
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: Fortinetproduct: FortiAnalyzer, FortiManager, FortiOS, FortiProxyAuthentication bypass
What
An authentication bypass vulnerability allows attackers to log into devices registered to other accounts.
Who is affected
Users with FortiCloud accounts and registered devices are affected.
Urgency
Immediate remediation is necessary due to active exploitation and critical severity.
Action
Implement the recommended security updates from Fortinet.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-01-27
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-24858

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-24858coverage & exploitation statusNVD · CVE.org

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