Vulnerability Description
TypeBot is a chatbot builder tool. Versions prior to 3.17.0 expose a deprecated public upload endpoint at `GET /api/v1/typebots/{typebotId}/blocks/{blockId}/storage/upload-url` that accepts an attacker-controlled `filePath` and returns a presigned S3 `PUT` URL for that exact key. Because the endpoint only checks that the referenced typebot is public and that the referenced block is a file input block, an unauthenticated attacker who knows a valid public `typebotId` and `blockId` can request presigned upload URLs for arbitrary objects in the shared bucket, including `private/...` and other tenants' `public/...` paths. Version 3.17.0 fixes this issue.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/baptisteArno/typebot.io/commit/7ae4c007d0987d2ca907b47e1b7418
- https://github.com/baptisteArno/typebot.io/pull/2459
- https://github.com/baptisteArno/typebot.io/releases/tag/v3.17.0
- https://github.com/baptisteArno/typebot.io/security/advisories/GHSA-m7f5-3wcm-x2
- https://github.com/baptisteArno/typebot.io/security/advisories/GHSA-m7f5-3wcm-x2
FAQ
What is CVE-2026-48763?
CVE-2026-48763 is a vulnerability with a CVSS score of 8.2 (HIGH). TypeBot is a chatbot builder tool. Versions prior to 3.17.0 expose a deprecated public upload endpoint at `GET /api/v1/typebots/{typebotId}/blocks/{blockId}/storage/upload-url` that accepts an attacke...
How severe is CVE-2026-48763?
CVE-2026-48763 has been rated HIGH with a CVSS base score of 8.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-48763?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.