CVE-2026-48763

HIGH 8.2

TypeBot has Arbitrary S3 Object Write in deprecated public upload endpoint via attacker-controlled filePath

CVSS Score

8.2

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-862
Vendor	baptistearno
Product	typebot.io
Published	Aug 11, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

Low

Affected Versions

baptisteArno / typebot.io

< 3.17.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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