CVE-2026-48768
TypeBot: Unauthenticated arbitrary s3 object write in generate-upload-url via unsanitized fileName
Description
TypeBot is a chatbot builder tool. In versions 3.16.1 and earlier, POST /api/blocks/file-input/v3/generate-upload-url is unauthenticated and uses unsanitized fileName input to construct public/ S3 object keys, while issuing presigned PUT URLs that do not bind Content-Type. As a result, any anonymous visitor to a published bot with a file input can upload attacker-controlled HTML, SVG, or JS to attacker-chosen subpaths, including other tenants’ publicly served result paths, enabling arbitrary content hosting and potential stored XSS on the storage origin. ../ traversal is blocked by S3/MinIO canonicalization (signature mismatch), but forward-slash path injection is exploitable. This issue has been fixed in version 3.17.0.
INFO
Published Date :
June 17, 2026, 11:13 p.m.
Last Modified :
June 17, 2026, 11:13 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Affected Products
The following products are affected by CVE-2026-48768
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update TypeBot to version 3.17.0.
- Review and restrict file upload permissions.
- Sanitize all user-supplied file names.
- Implement content type validation for uploads.
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CVE-2026-48768 vulnerability anywhere in the article.