{"id":"GHSA-c37p-4qqg-3p76","summary":"OpenClaw Twilio voice-call webhook auth bypass when ngrok loopback compatibility is enabled","details":"## Summary\n\nA Twilio webhook signature-verification bypass in the voice-call extension could allow unauthenticated webhook requests when a specific ngrok free-tier compatibility option is enabled.\n\n## Impact\n\nThis issue is limited to configurations that explicitly enable and expose the voice-call webhook endpoint.\n\nNot affected by default:\n- The voice-call extension is optional and disabled by default.\n- The bypass only applied when `tunnel.allowNgrokFreeTierLoopbackBypass` was explicitly enabled.\n- Exploitation required the webhook to be reachable (typically via a public ngrok URL during development).\n\nWorst case (when exposed and the option was enabled):\n- An external attacker could send forged requests to the publicly reachable webhook endpoint that would be accepted without a valid `X-Twilio-Signature`.\n- This could result in unauthorized webhook event handling (integrity) and request flooding (availability).\n\n## Affected Packages / Versions\n\n- Package: `openclaw` (npm)\n- Affected versions: `\u003c= 2026.2.13` (latest published as of 2026-02-14)\n- Patched versions: `\u003e= 2026.2.14` (planned next release; pending publish)\n\n## Fix\n\n`allowNgrokFreeTierLoopbackBypass` no longer bypasses signature verification. It only enables trusting forwarded headers on loopback so the public ngrok URL can be reconstructed for correct signature validation.\n\nFix commit(s):\n- ff11d8793b90c52f8d84dae3fbb99307da51b5c9\n\nThanks @p80n-sec for reporting.","aliases":["CVE-2026-29606"],"modified":"2026-03-06T01:16:32.202220Z","published":"2026-02-18T00:54:48Z","database_specific":{"github_reviewed_at":"2026-02-18T00:54:48Z","nvd_published_at":"2026-03-05T22:16:23Z","cwe_ids":["CWE-306"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/openclaw/openclaw/security/advisories/GHSA-c37p-4qqg-3p76"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-29606"},{"type":"WEB","url":"https://github.com/openclaw/openclaw/commit/ff11d8793b90c52f8d84dae3fbb99307da51b5c9"},{"type":"PACKAGE","url":"https://github.com/openclaw/openclaw"},{"type":"WEB","url":"https://github.com/openclaw/openclaw/releases/tag/v2026.2.14"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/openclaw-webhook-signature-verification-bypass-via-ngrok-loopback-compatibility"}],"affected":[{"package":{"name":"openclaw","ecosystem":"npm","purl":"pkg:npm/openclaw"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2026.2.14"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-c37p-4qqg-3p76/GHSA-c37p-4qqg-3p76.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"}]}