CVE-2026-48495 TypeBot Google Sheets OAuth callback can create credentials in unauthorized workspaces and modify arbitrary typebots
An authenticated attacker can manipulate OAuth state parameters to create credentials in unauthorized workspaces and modify arbitrary Typebots.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-48495?
CVE-2026-48495 is a high-severity missing authorization vulnerability in baptisteArno typebot.io, published on 11 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Weakness: CWE-862
Which versions are affected by CVE-2026-48495?
How do I fix CVE-2026-48495?
No fix has been published for CVE-2026-48495 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-48495 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48495 exists.
Sources
Also known as GHSA-w789-9gxq-2xcj.