---
id: "CVE-2026-121530"
page: "https://infrastack.ai/live/CVE-2026-121530"
kind: "vulnerability"
aliases: ["CVE-2026-121530"]
title: "Fortinet FortiOS: invalid token accepted after valid login grants improper access"
severity: "medium"
cvss: 6.6
epss: null
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["firewall", "fortinet", "fortios", "vendor", "vpn"]
not_affected_if: ["no-remote-admin-or-vpn-login", "other-fortios-versions"]
published_at: "2026-11-10T20:18:56+00:00"
first_seen_at: "2026-11-10T20:46:04+00:00"
updated_at: "2026-11-10T20:48:04+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121530", "first_seen_at": "2026-11-10T20:46:04+00:00"}]
exploit_sources: []
---

# Fortinet FortiOS: invalid token accepted after valid login grants improper access

Link for people: https://infrastack.ai/live/CVE-2026-121530 (this .md is for agents)

Fortinet FortiOS 7.6.0 through 7.6.6 has an improper authentication flaw where an invalid token is accepted after a valid username and password are entered. A remote attacker with valid credentials can gain access control they should not have.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the FortiOS version on the appliance or in the management console against `7.6.0` through `7.6.6`

## Fix

- FortiOS: move to a version outside `7.6.0` through `7.6.6`; the exact fixed version is unknown from the sources

## Timeline

- 2026-11-10T20:46:04+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121530

## From the sources

A improper authentication vulnerability in Fortinet FortiOS 7.6.0 through 7.6.6 may allow a remote authenticated attacker to gain improper access control via an invalid token after entering a valid username and password

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_