Vulnerability · Published Jun 17, 2026 · Assigned by GitHub_M

CVE-2026-48768TypeBot: Unauthenticated arbitrary s3 object write in generate-upload-url via unsanitized fileName

Critical 9.3

In plain English

A critical-severity path traversal 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 0.3% (higher than 26% of all known vulnerabilities).

Severity (CVSS 3.1)9.3Critical

Exploit odds (30 days)0.3%top 74.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
baptisteArno	typebot.io	< 3.17.0

Weakness: CWE-22, CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N

References

https://github.com/baptisteArno/typebot.io/security/advisories/GHSA-fp7x-6pqh-vhvf x_refsource_CONFIRM
https://github.com/baptisteArno/typebot.io/releases/tag/v3.17.0 x_refsource_MISC