CVE-2026-24858
Actively exploited. CVE-2026-24858 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-01-27) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching 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
- 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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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 100% of all EPSS-scored CVEs.
Advisory coverage (1)
- criticalexploitedCVE-2026-24858: Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerabil…cisa-kev · 2026-01-27
External references
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