# CVE-2026-39969: TypeBot: WhatsApp Webhook Endpoint Missing Signature Verification

> Unauthenticated attackers can spoof WhatsApp webhook messages to trigger bot flows and consume resources due to missing signature verification.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 22 May 2026
- **Updated:** 23 May 2026
- **Also known as:** GHSA-8vqp-r5w7-v47f

## What is CVE-2026-39969?

CVE-2026-39969 is a medium-severity missing authorization vulnerability in baptisteArno typebot.io, published on 22 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

TypeBot is a chatbot builder tool. In versions 3.16.0 and prior, the WhatsApp Cloud API webhook endpoint (POST /v1/workspaces/{workspaceId}/whatsapp/{credentialsId}/webhook) does not verify the x-hub-signature-256 HMAC signature included by Meta in every webhook delivery. The webhook URL exposes both workspaceId and credentialsId as path parameters, which are logged in web server access logs, visible in Meta's webhook configuration dashboard, and potentially shared when configuring integrations. This allows any unauthenticated attacker to send spoofed webhook messages to trigger bot flows, consume API resources, and interact with external services using the workspace owner's credentials. The issue has been fixed in version 3.17.0.

Weakness: CWE-345 (Insufficient Verification of Data Authenticity), CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2026-39969?


## How do I fix CVE-2026-39969?

No fix has been published for CVE-2026-39969 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-39969 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39969 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-39969 and fix it if it is affected.

What it is: CVE-2026-39969 is a medium-severity missing authorization vulnerability in baptisteArno typebot.io, published on 22 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39969 exists.

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-2026-39969/ (Markdown: https://insights.sbomify.com/CVE-2026-39969/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-39969
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-39969
- OSV: https://osv.dev/vulnerability/CVE-2026-39969

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-39969/
Summaries are generated and may contain mistakes; the official description above is the record.