PatchSiren cyber security CVE debrief
CVE-2026-39969 baptisteArno CVE debrief
CVE-2026-39969 is a vulnerability in TypeBot versions 3.16.0 and prior. The WhatsApp Cloud API webhook endpoint does not verify the x-hub-signature-256 HMAC signature. This allows unauthenticated attackers to send spoofed webhook messages, consume API resources, and interact with external services using the workspace owner's credentials. The issue has been fixed in version 3.17.0. Affected users should update to the latest version and review webhook configurations.
- Vendor
- baptisteArno
- Product
- typebot.io
- CVSS
- MEDIUM 6.5
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-05-22
- Original CVE updated
- 2026-07-23
- Advisory published
- 2026-05-22
- Advisory updated
- 2026-07-23
Who should care
Users of TypeBot versions 3.16.0 and prior should update to version 3.17.0 to fix the vulnerability. The vulnerability allows unauthenticated attackers to send spoofed webhook messages, which could lead to unauthorized interactions with external services. Operators, platform administrators, and security teams should review affected deployments and plan updates or mitigations.
Technical summary
The WhatsApp Cloud API webhook endpoint in TypeBot versions 3.16.0 and prior 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.
Defensive priority
High priority for users of affected TypeBot versions due to the potential for unauthorized interactions with external services and high exploitability.
Recommended defensive actions
- Update TypeBot to version 3.17.0 or later
- Review and restrict access to webhook configuration and logs
- Monitor for suspicious webhook activity
- Implement additional authentication and validation for webhook messages
- Review compensating controls for exposed systems while remediation is scheduled and verified
- Check relevant monitoring, detection, and logs for exposed assets that need extra review
- Track exceptions, retest remediated assets, and close the item only after evidence is documented
Evidence notes
The CVE record was published on 2026-05-22T19:17:03.500Z and last modified on 2026-07-23T16:10:00.137Z. The NVD entry is currently Deferred. Evidence is limited to CVE and NVD details. Defenders should verify affected TypeBot versions and configurations.
Official resources
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-05-22T19:17:03.500Z and has not been modified since then. The NVD entry is currently Deferred.