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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenClaw | OpenClaw | < 2026.2.14 | 2026.2.14 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | openclaw | < 2026.2.14 | 2026.2.14 | GHSA-c37p-4qqg-3p76 |
Advisories 1
- WID-SEC-2026-0424 OpenClaw: Mehrere Schwachstellen BSI CERT-Bund (WID) · Mar 5, 2026
References
- GitHub Security Advisory (GHSA-c37p-4qqg-3p76) vendor-advisory
- Patch Commit patch
- VulnCheck Advisory: OpenClaw < 2026.2.14 - Webhook Signature Verification Bypass via ngrok Loopback Compatibility third-party-advisory