Vulnerability · Published Aug 11, 2026 · Assigned by GitHub_M
CVE-2026-48495TypeBot Google Sheets OAuth callback can create credentials in unauthorized workspaces and modify arbitrary typebots
High 7.1
In plain English
A high-severity missing authorization in typebot.io from baptisteArno. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| baptisteArno | typebot.io | < 3.17.0 |
Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
References
- https://github.com/baptisteArno/typebot.io/security/advisories/GHSA-w789-9gxq-2xcj x_refsource_CONFIRM
- https://github.com/baptisteArno/typebot.io/pull/2501 x_refsource_MISC
- https://github.com/baptisteArno/typebot.io/commit/c0ffd825e2f4ee2256a157fd085fb624dcede625 x_refsource_MISC
- https://github.com/baptisteArno/typebot.io/releases/tag/v3.17.0 x_refsource_MISC