CVE-2026-29606
Received Received - Intake
Webhook Signature Verification Bypass in OpenClaw Voice-Call Extension

Publication date: 2026-03-05

Last updated on: 2026-03-11

Assigner: VulnCheck

Description
OpenClaw versions prior to 2026.2.14 contain a webhook signature-verification bypass in the voice-call extension that allows unauthenticated requests when the tunnel.allowNgrokFreeTierLoopbackBypass option is explicitly enabled. An external attacker can send forged requests to the publicly reachable webhook endpoint without a valid X-Twilio-Signature header, resulting in unauthorized webhook event handling and potential request flooding attacks.
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Meta Information
Published
2026-03-05
Last Modified
2026-03-11
Generated
2026-06-16
AI Q&A
2026-03-06
EPSS Evaluated
2026-06-15
NVD
CVE-2026-29606
EUVD
EUVD-2026-9932
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
openclaw openclaw to 2026.2.14 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
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Executive Summary

This vulnerability exists in OpenClaw versions prior to 2026.2.14 and involves a webhook signature-verification bypass in the voice-call extension.

When the tunnel.allowNgrokFreeTierLoopbackBypass option is explicitly enabled, an external attacker can send forged requests to the publicly reachable webhook endpoint without needing a valid X-Twilio-Signature header.

This allows unauthorized webhook event handling and can lead to potential request flooding attacks.

Impact Analysis

The vulnerability allows an attacker to bypass signature verification and send unauthorized requests to the webhook endpoint.

This can result in unauthorized handling of webhook events, which may lead to security breaches or manipulation of system behavior.

Additionally, the attacker can perform request flooding attacks, potentially causing denial of service or resource exhaustion.

Compliance Impact

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