What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-11 · updated 2026-10-23
• Weakness: CWE-862

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

• baptisteArno typebot.io: before 3.17.0

References

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

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