CVE-2023-26208

LOW

Fortinet FortiAuthenticator <6.4 - DoS

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2023-26208. PoCs published by chessredoffsec.

AI-analyzed exploit summary This repository contains a Python script with a Tkinter GUI that automates sending crafted login requests to exploit CVE-2023-26208, a vulnerability likely related to payload size manipulation in a login endpoint. The script allows users to specify target IP and payload size, then sends continuous POST requests to /logincheck with oversized username and password fields.

Description

A improper restriction of excessive authentication attempts vulnerability [CWE-307] in Fortinet FortiAuthenticator 6.4.x and before allows a remote unauthenticated attacker to partially exhaust CPU and memory via sending numerous HTTP requests to the login form.

Exploits (1)

nomisec WORKING POC 1 stars
by chessredoffsec · poc
https://github.com/chessredoffsec/CVE-2023-26208

This repository contains a Python script with a Tkinter GUI that automates sending crafted login requests to exploit CVE-2023-26208, a vulnerability likely related to payload size manipulation in a login endpoint. The script allows users to specify target IP and payload size, then sends continuous POST requests to /logincheck with oversized username and password fields.

Classification
Working Poc 80%
Attack Type
Dos
Complexity
Moderate
Reliability
Theoretical
Target: Unknown (likely a web application with a vulnerable login endpoint)
No auth needed
Prerequisites: Target IP address · Network access to the vulnerable endpoint
devstral-2 · analyzed Feb 19, 2026 Full analysis →

References (1)

Core 1
Core References

Scores

CVSS v3 3.7
EPSS 0.0181
EPSS Percentile 75.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-307
Status published
Products (1)
fortinet/fortiauthenticator 5.4.0 - 6.5.0
Published Mar 09, 2023
Tracked Since Feb 18, 2026