Vulnerability · Published Aug 11, 2026 · Assigned by GitHub_M

CVE-2026-48763TypeBot has Arbitrary S3 Object Write in deprecated public upload endpoint via attacker-controlled filePath

High 8.2

In plain English

A high-severity missing authorization 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 0.5% (higher than 45% of all known vulnerabilities).

Severity (CVSS 3.1)8.2High

Exploit odds (30 days)0.5%top 55.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
baptisteArno	typebot.io	< 3.17.0

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

References

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