---
id: "CVE-2026-126161"
page: "https://infrastack.ai/live/CVE-2026-126161"
kind: "vulnerability"
aliases: ["CVE-2026-126161"]
title: "Fortinet FortiMail: unauthenticated requests can exhaust resources and cause denial of service"
severity: "high"
cvss: 7.5
epss: null
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["email-security", "fortimail", "fortinet", "vendor"]
not_affected_if: ["unaffected-version"]
published_at: "2026-11-11T22:17:14+00:00"
first_seen_at: "2026-11-11T22:29:28+00:00"
updated_at: "2026-11-11T22:32:08+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-126161", "first_seen_at": "2026-11-11T22:29:28+00:00"}]
exploit_sources: []
---

# Fortinet FortiMail: unauthenticated requests can exhaust resources and cause denial of service

Link for people: https://infrastack.ai/live/CVE-2026-126161 (this .md is for agents)

FortiMail 8.0.0 through 8.0.1, 7.6.0 through 7.6.6 and 7.4.0 through 7.4.6 have an uncontrolled resource consumption flaw. A remote attacker without credentials can send repeated unauthenticated POST requests to make the service unavailable.

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

## How to check

- Check the installed FortiMail version in the admin console and compare it with the affected ranges: `8.0.0` to `8.0.1`, `7.6.0` to `7.6.6`, `7.4.0` to `7.4.6`.

## Fix

- Fixed versions are not stated in the sources; check the Fortinet advisory for the fixed release of each affected branch.

## Timeline

- 2026-11-11T22:29:28+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-126161

## From the sources

A uncontrolled resource consumption vulnerability in Fortinet FortiMail 8.0.0 through 8.0.1, FortiMail 7.6.0 through 7.6.6, FortiMail 7.4.0 through 7.4.6 may allow a remote unauthenticated attacker to cause a denial of service via repeated unauthenticated POST requests.

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