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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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-39969 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-39969

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-39969 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-39969

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.