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

> Authenticated users can remove other workspaces' custom domains by bypassing ownership checks, causing service disruption for affected tenants.

- **Severity:** Medium 6.4 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Aug 2026
- **Updated:** 27 Aug 2026
- **Also known as:** GHSA-7h82-p425-wpmg

## What is CVE-2026-62861?

CVE-2026-62861 is a medium-severity missing authorization vulnerability in baptisteArno typebot.io, published on 25 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### 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.

Weakness: CWE-862 (Missing Authorization), CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-62861?


## How do I fix CVE-2026-62861?

No fix has been published for CVE-2026-62861 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-62861 being exploited?

There is no known exploitation of CVE-2026-62861 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-62861 and fix it if it is affected.

What it is: CVE-2026-62861 is a medium-severity missing authorization vulnerability in baptisteArno typebot.io, published on 25 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-62861 in the wild and no public exploit code.

Affected product: baptisteArno typebot.io. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-62861/ (Markdown: https://insights.sbomify.com/CVE-2026-62861/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-62861
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-62861
- OSV: https://osv.dev/vulnerability/CVE-2026-62861

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-62861/
Summaries are generated and may contain mistakes; the official description above is the record.