Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/baptisteArno/typebot.io/commit/c0ffd825e2f4ee2256a157fd085fb6
- https://github.com/baptisteArno/typebot.io/pull/2501
- https://github.com/baptisteArno/typebot.io/releases/tag/v3.17.0
- https://github.com/baptisteArno/typebot.io/security/advisories/GHSA-w789-9gxq-2x
- https://github.com/baptisteArno/typebot.io/security/advisories/GHSA-w789-9gxq-2x
FAQ
What is CVE-2026-48495?
CVE-2026-48495 is a vulnerability with a CVSS score of 7.1 (HIGH). 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`, `blockI...
How severe is CVE-2026-48495?
CVE-2026-48495 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-48495?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.