CVE-2026-33712: TypeBot: Unauthenticated SSRF via isolated-vm fetch in preview chat endpoint bypasses SSRF controls
Typebot is a chatbot builder tool. In versions 3.15.2 and prior, the preview chat endpoint (POST /api/v1/typebots/{typebotId}/preview/startChat) allows unauthenticated users to achieve Server-Side Request Forgery (SSRF) by supplying a custom typebot definition with server-side code blocks. The fetch function exposed inside the isolated-vm sandbox calls Node.js native fetch without the SSRF validation (validateHttpReqUrl) that protects the HTTP Request block. This bypasses all SSRF mitigations added after GHSA-8gq9-rw7v-3jpr. Exploitation of this unauthenticated SSRF vulnerability can lead to cloud credential theft, internal network access and data exfiltration for any self-hosted Typebot deployments and hosted services. This issue has been fixed in version 3.16.0.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Typebotto a version that resolves this vulnerability.Fixed in 3.16.0Patch Typebot: Unauthenticated SSRF via isolated-vm fetch in preview chat endpoint bypasses SSRF controls - Compensating control
If you cannot upgrade immediately from versions 3.15.2 and prior, mitigate exploitation of the unauthenticated preview chat SSRF by restricting network/firewall access to the preview chat endpoint POST /api/v1/typebots/{typebotId}/preview/startChat to trusted users or internal networks only.
Event History
Frequently Asked Questions
What is the severity of CVE-2026-33712?
The severity of CVE-2026-33712 is critical with a score of 10.
How do I fix CVE-2026-33712?
To address CVE-2026-33712, upgrade Typebot to version 3.16.0 or later.
What type of vulnerability is CVE-2026-33712?
CVE-2026-33712 is a Server-Side Request Forgery (SSRF) vulnerability.
Who is affected by CVE-2026-33712?
Users of Typebot versions 3.15.2 and prior are affected by CVE-2026-33712.
What can be exploited in CVE-2026-33712?
CVE-2026-33712 allows unauthenticated users to execute server-side requests through the preview chat endpoint.