CVE-2026-48494: CWE-639: Authorization Bypass Through User-Controlled Key in baptisteArno typebot.io
TypeBot is a chatbot builder tool. In version 3.16.1, an authenticated user who has read access to any typebot can resume a WhatsApp preview webhook session that belongs to a different typebot by mixing an authorized `typebotId` and `blockId` and a foreign preview phone number tied to another preview session. The WhatsApp test-webhook handler authorizes the parent typebot first, but then resolves the preview chat session only by `wa-preview-{phone}`. As a result, an attacker can inject arbitrary webhook JSON into another workspace's WhatsApp preview session and advance its draft/unpublished flow without any access to the victim typebot. Version 3.17.0 patches the issue.
AI Analysis
Technical Summary
TypeBot version 3.16.1 contains an authorization bypass vulnerability (CWE-639) where the WhatsApp test-webhook handler authorizes the parent typebot but resolves the preview chat session solely by a phone number identifier (wa-preview-{phone}). This flaw enables an authenticated user with read access to one typebot to resume and manipulate a WhatsApp preview webhook session of a different typebot by mixing valid typebotId and blockId with a foreign preview phone number. Consequently, the attacker can inject arbitrary webhook JSON into another workspace's WhatsApp preview session and advance its draft or unpublished flow without having access rights to the victim typebot. The vulnerability is addressed in version 3.17.0.
Potential Impact
An attacker with read access to any typebot can bypass authorization controls to interfere with WhatsApp preview webhook sessions of other typebots. This allows injection of arbitrary webhook JSON payloads into another workspace's preview session and progression of draft or unpublished chatbot flows without proper access. This could lead to unauthorized manipulation of chatbot behavior in victim workspaces.
Mitigation Recommendations
Upgrade to typebot.io version 3.17.0 or later, where this authorization bypass vulnerability has been fixed. Patch status is not explicitly stated but the issue is resolved in 3.17.0. Until upgrading, restrict read access to typebots to trusted users only to reduce risk.
CVE-2026-48494: CWE-639: Authorization Bypass Through User-Controlled Key in baptisteArno typebot.io
Description
TypeBot is a chatbot builder tool. In version 3.16.1, an authenticated user who has read access to any typebot can resume a WhatsApp preview webhook session that belongs to a different typebot by mixing an authorized `typebotId` and `blockId` and a foreign preview phone number tied to another preview session. The WhatsApp test-webhook handler authorizes the parent typebot first, but then resolves the preview chat session only by `wa-preview-{phone}`. As a result, an attacker can inject arbitrary webhook JSON into another workspace's WhatsApp preview session and advance its draft/unpublished flow without any access to the victim typebot. Version 3.17.0 patches the issue.
CVSS v4.0
Score 7.1high
Affected software
baptisteArno
typebot.io
pkg:github/baptistearno/typebot.ioRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
TypeBot version 3.16.1 contains an authorization bypass vulnerability (CWE-639) where the WhatsApp test-webhook handler authorizes the parent typebot but resolves the preview chat session solely by a phone number identifier (wa-preview-{phone}). This flaw enables an authenticated user with read access to one typebot to resume and manipulate a WhatsApp preview webhook session of a different typebot by mixing valid typebotId and blockId with a foreign preview phone number. Consequently, the attacker can inject arbitrary webhook JSON into another workspace's WhatsApp preview session and advance its draft or unpublished flow without having access rights to the victim typebot. The vulnerability is addressed in version 3.17.0.
Potential Impact
An attacker with read access to any typebot can bypass authorization controls to interfere with WhatsApp preview webhook sessions of other typebots. This allows injection of arbitrary webhook JSON payloads into another workspace's preview session and progression of draft or unpublished chatbot flows without proper access. This could lead to unauthorized manipulation of chatbot behavior in victim workspaces.
Mitigation Recommendations
Upgrade to typebot.io version 3.17.0 or later, where this authorization bypass vulnerability has been fixed. Patch status is not explicitly stated but the issue is resolved in 3.17.0. Until upgrading, restrict read access to typebots to trusted users only to reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-21T15:33:08.292Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a7b5eeabf8831d5391df913
Added to database: 08/11/2026, 17:42:02 UTC
Last enriched: 08/11/2026, 17:56:42 UTC
Last updated: 09/25/2026, 01:47:43 UTC
Views: 60
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