CVE-2026-29606Network attack vector

Unauthenticated webhook handling via signature bypass

Published Mar 5, 2026 · Updated Mar 5, 2026

Authentication bypass in OpenClaw before 2026.2.14 allows remote attackers to submit forged Twilio voice-call webhook events. The verifyTwilioWebhook function treated failed signature checks as successful for loopback requests using an ngrok free-tier URL when the compatibility option was set. The optional extension is disabled by default; exploitation requires explicit enablement, a public webhook, and the compatibility setting, and causes unauthorized event handling or request flooding.

CVSS severity6.3
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in OpenClaw before 2026.2.14 allows remote attackers to submit forged Twilio voice-call webhook events. The verifyTwilioWebhook function treated failed signature checks as successful for loopback requests using an ngrok free-tier URL when the compatibility option was set. The optional extension is disabled by default; exploitation requires explicit enablement, a public webhook, and the compatibility setting, and causes unauthorized event handling or request flooding.

The record

CVE
CVE-2026-29606
Published
Mar 5, 2026
Updated
Mar 5, 2026
Vendor
OpenClaw Foundation
Product
OpenClaw
Classifications
CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2026.2.14

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenClaw Foundation · OpenClawversion=0 <2026.2.14

Published CVSS scores

6.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
6.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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