CVE-2026-24858 — Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability
Overview
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.
Vulnerability details
- CVE ID
- CVE-2026-24858
- Vulnerability
- Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability
- Vendor
- Fortinet
- Affected products
- Fortinet: Multiple Products
- Severity
- HIGH
- Exploitation status
- Actively exploited in the wild (CISA KEV)
- Published
- 2026-01-27
Remediation guidance
CVE-2026-24858 is in CISA's Known Exploited Vulnerabilities (KEV) catalog — U.S. federal civilian agencies are required to remediate it under Binding Operational Directive 22-01. Treat it as a priority for every environment.
Apply the vendor's official security update for Fortinet the affected product as soon as possible. Where a patch is unavailable, apply vendor mitigations or isolate/segment exposed systems.
Hunt for indicators of compromise tied to this vulnerability and confirm logging/EDR coverage on affected assets.
Authoritative references
Remediate CVE-2026-24858 — and stay ahead of the next one
CVE-2026-24858 is listed in the CISA KEV catalog as actively exploited — treat remediation as urgent. Scan your domain free to see whether CVE-2026-24858 and other Fortinet issues affect you and get a prioritized remediation report (full report from ₹999) — or stream the full feed of 1,600+ actively-exploited CVEs straight into your SOC.
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