baptisteArno Typebot up to 3.16.9 Google Sheets OAuth Callback state improper authorization

Summaryinfo

A vulnerability, which was classified as critical, has been found in baptisteArno Typebot up to 3.16.9. This vulnerability affects unknown code of the component Google Sheets OAuth Callback. The manipulation of the argument state leads to improper authorization. This vulnerability is listed as CVE-2026-48495. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in baptisteArno Typebot up to 3.16.9 and classified as critical. This issue affects an unknown functionality of the component Google Sheets OAuth Callback. The manipulation of the argument state with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

TypeBot is a chatbot builder tool. Prior to version 3.17.0, the Google Sheets OAuth callback decodes a base64-encoded JSON `state` parameter and trusts the embedded `workspaceId`, `typebotId`, `blockId`, and `redirectUrl` without cryptographic integrity protection or authorization checks. The callback route is authenticated, but it does not verify that the authenticated user has write access to the target workspace or Typebot before creating credentials in the workspace or updating Typebot groups. An authenticated user who can obtain a valid Google OAuth `code` can alter the `state` value to create Google Sheets credentials in another workspace and, if target IDs are known, attach those credentials to a block in another Typebot. Version 3.17.0 patches the issue.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-48495 since 05/21/2026. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

Upgrading to version 3.17.0 eliminates this vulnerability.

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Productinfo

Vendor

• baptisteArno

Name

• Typebot

Version

• 3.16.0
• 3.16.1
• 3.16.2
• 3.16.3
• 3.16.4
• 3.16.5
• 3.16.6
• 3.16.7
• 3.16.8
• 3.16.9

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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