Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability

Fortinet Multiple Products

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. Added to CISA KEV on 2026-01-27 (federal deadline 2026-01-30).

First seen: 27 Jan 2026
Last update: 27 Jan 2026, 12:00 UTC
Identifiers: CVE-2026-24858
Source: CISA KEV
On the menu as: VPN & firewalls

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability
Severity: high, exploited in the wild. Patch status: patched.
Affected: Fortinet Multiple Products
Ids: CVE-2026-24858

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. Added to CISA KEV on 2026-01-27 (federal deadline 2026-01-30).

## Steps
1. This touches infrastructure (vpn-edge). Look in terraform, ansible, cloud-init, Dockerfiles and docs for the product and version we run. If it isn't in the repo, say so and list what a human should check on the box.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-24858") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://nvd.nist.gov/vuln/detail/CVE-2026-24858 https://www.fortinet.com/blog/psirt-blogs/analysis-of-sso-abuse-on-fortios
https://pwned.coffee/i/fortinet-multiple-products-authentication-bypass-using-a-cve-2026-24858

Sources

Totalone hot coffee