Vulnerability · Published Aug 25, 2026 · Assigned by GitHub_M

CVE-2026-62861TypeBot: Cross-tenant custom-domain removal via unbound `name` in handleDeleteCustomDomain

Medium 6.4

In plain English

A medium-severity authorization bypass via user-controlled key in typebot.io from baptisteArno. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities).

Severity (CVSS 4.0)6.4Medium

Exploit odds (30 days)0.4%top 64.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

TypeBot is a chatbot builder tool. Prior to 3.18.0, any authenticated non-guest workspace member can remove another workspace's public custom domain and make typebots on that domain unavailable. The custom-domain delete handler in handleDeleteCustomDomain.ts authorizes a caller against a client-supplied workspaceId but sends the client-supplied domain name to the shared Vercel project before verifying that the domain belongs to that workspace. This issue is fixed in version 3.18.0.

Affected products (as reported)

Vendor	Product	Versions
baptisteArno	typebot.io	< 3.18.0

Weakness: CWE-639, CWE-862 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:H

References

https://github.com/baptisteArno/typebot.io/security/advisories/GHSA-7h82-p425-wpmg x_refsource_CONFIRM
https://github.com/baptisteArno/typebot.io/commit/06575dfcd461ba76071012869d4b1f4046f9a6b8 x_refsource_MISC
https://github.com/baptisteArno/typebot.io/releases/tag/v3.18.0 x_refsource_MISC