Executive brief
TypeBot is an open-source chatbot builder that allows users to create and host conversational agents. A security flaw in how the system validates web addresses allows attackers to bypass safety filters and force the server to connect to internal network resources. This could lead to the theft of sensitive cloud credentials, access to private internal databases, or the exposure of administrative panels not intended for public access.
Technical details
A Server-Side Request Forgery (SSRF) vulnerability exists in TypeBot due to a Time-of-Check to Time-of-Use (TOCTOU) flaw in its URL validation logic. The `validateHttpReqUrl` function resolves a hostname to check against forbidden IP ranges, but the subsequent `fetch` call performs a second, independent DNS resolution using the original hostname rather than pinning the validated IP. An attacker can use DNS rebinding to return a safe IP during the check and a private/internal IP (such as 169.254.169.254) during the actual request. This can be exploited via public chat APIs if a bot is configured to perform server-side HTTP requests or script fetches using user-supplied input. The issue is fixed in version 3.17.2.
Affected products
- baptisteArno typebot.io < 3.17.2
Timeline
- 2026-05-24: advisory: Internal GHSA advisory published
- 2026-06-17: patched: Version 3.17.2 released
- 2026-06-18: disclosed: CVE-2026-48764 published to NVD