CVE-2026-34207

HIGH

TypeBot: SSRF Protection Bypass via DNS-Resolved Hostnames in Webhook / HTTP Request Validation

Title source: cna

Exploitation Summary

EIP tracks 1 public exploit for CVE-2026-34207. PoCs published by 0xmrma.

AI-analyzed exploit summary This repository provides a detailed technical analysis of CVE-2026-34207, an SSRF vulnerability in Typebot due to hostname validation occurring before DNS resolution. The writeup includes root cause analysis, proof-of-concept demonstrations, and fix details.

Description

TypeBot is a chatbot builder tool. In versions prior to 3.16.0, SSRF protection for Webhook / HTTP Request blocks validates only the URL string, blocked hostname literals, and literal IP formats. It does not resolve DNS before allowing the request. As a result, a hostname such as ssrf-repro.example that resolves to 127.0.0.1, 169.254.169.254, or RFC1918/private space passes validation and is later fetched by the backend HTTP client. This enables server-side request forgery to loopback, cloud metadata, and private network targets. This issue has been resolved in version 3.16.0.

Exploits (1)

nomisec WRITEUP

by 0xmrma · poc

https://github.com/0xmrma/CVE-2026-34207

View Code ZIP pw:eip

This repository provides a detailed technical analysis of CVE-2026-34207, an SSRF vulnerability in Typebot due to hostname validation occurring before DNS resolution. The writeup includes root cause analysis, proof-of-concept demonstrations, and fix details.

Classification

Writeup 100%

Attack Type

Ssrf

Complexity

Moderate

Reliability

Reliable

Target: Typebot (versions before 3.16.0)

Auth required

Prerequisites: ability to configure or trigger a Webhook/HTTP Request block in Typebot · control over DNS resolution for a custom hostname

MITRE ATT&CK

T1190 - Exploit Public-Facing Application T1210 - Exploitation of Remote Services

mistral-large-3 · analyzed Jun 26, 2026 Full analysis →

References (3)

Core 3

Core References

X_Refsource_Confirm x_refsource_confirm

https://github.com/baptisteArno/typebot.io/security/advisories/GHSA-grcc-6x37-wwgp

X_Refsource_Misc x_refsource_misc

https://github.com/baptisteArno/typebot.io/commit/23818bb0e54db23c456ee3fa6b12d82b2af848b8

View Writeup ZIP pw:eip

X_Refsource_Misc x_refsource_misc

https://github.com/baptisteArno/typebot.io/releases/tag/v3.16.0

Scores

CVSS v3 7.6

EPSS 0.0024

EPSS Percentile 15.1%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact partial

Details

CWE

CWE-20 CWE-918

Status published

Products (1)

baptisteArno/typebot.io < 3.16.0

Published May 22, 2026

Tracked Since May 22, 2026