---
id: CVE-2025-59923
title: >-
  An improper access control vulnerability in Fortinet FortiAuthenticator 6.6.0
  through 6.6.6, FortiAuthenticator 6.5 all versions, FortiAuthenticator 6.4 all
  versions, FortiAuthenticator 6.3 all versions may allow an authenticated
  attacke…
summary: >-
  An improper access control vulnerability in Fortinet FortiAuthenticator 6.6.0
  through 6.6.6, FortiAuthenticator 6.5 all versions, FortiAuthenticator 6.4 all
  versions, FortiAuthenticator 6.3 all versions may allow an authenticated
  attacke…
severity: low
cvss: 2.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-284
vendor: fortinet
product: fortiauthenticator
affected:
  - 'fortiauthenticator >= 6.3.0, <= 6.6.4'
published: '2025-12-09'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T21:10:00.183'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-59923'
references:
  - url: 'https://fortiguard.fortinet.com/psirt/FG-IR-25-616'
    label: psirt@fortinet.com
tags:
  - nvd
epss: 0.00213
epssPercentile: 0.10778
ingestedAt: '2026-10-14T21:57:04.757Z'
---

## Overview

An improper access control vulnerability in Fortinet FortiAuthenticator 6.6.0 through 6.6.6, FortiAuthenticator 6.5 all versions, FortiAuthenticator 6.4 all versions, FortiAuthenticator 6.3 all versions may allow an authenticated attacker with at least read-only admin permission to obtain the credentials of other administrators' messaging services via crafted requests.

## Affected

- `fortiauthenticator >= 6.3.0, <= 6.6.4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.