Auth bypass in Openclaw
CVE-2026-29606
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
EPSS: 0.005 (38.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Openclaw — versions 0
Weakness classification (CWE)
References
- github.com/openclaw/openclaw/security/advisories/GHSA-c37p-4qqg-3p76 (vendor-advisory, Vendor Advisory)
- github.com/openclaw/openclaw/commit/ff11d8793b90c52f8d84dae3fbb99307da51b5c9 (Patch, patch)
- www.vulncheck.com/advisories/openclaw-webhook-signature-verification-bypass-via… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-29606?
- CVE-2026-29606 is a medium-severity vulnerability in Openclaw, classified under Missing Authentication for Critical Function. CVSS score: 6.5/10. Published 2026-03-05.
- How severe is CVE-2026-29606?
- Medium severity. CVSS v3 base score is 6.5 out of 10.