CVE-2026-48763

Summary

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.

Affected Software

Weaknesses

• CWE-862: CWE-862: Missing Authorization

References

• https://github.com/baptisteArno/typebot.io/security/advisories/GHSA-m7f5-3wcm-x2c4
• https://github.com/baptisteArno/typebot.io/pull/2459
• https://github.com/baptisteArno/typebot.io/commit/7ae4c007d0987d2ca907b47e1b7418db62b8a157
• https://github.com/baptisteArno/typebot.io/releases/tag/v3.17.0

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