EUVD-2026-17389
CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4Description
OpenClaw before 2026.3.12 applies rate limiting only after successful webhook authentication, allowing attackers to bypass rate limits and brute-force webhook secrets. Attackers can submit repeated authentication requests with invalid secrets without triggering rate limit responses, enabling systematic secret guessing and subsequent forged webhook submission.
Analysis
Webhook secret brute-forcing in OpenClaw before 2026.3.12 enables attackers to forge authenticated webhooks by exploiting pre-authentication rate limit bypass. Unauthenticated remote attackers can systematically guess webhook secrets without triggering rate limiting (which only applies post-authentication), then submit forged webhook payloads to compromise system integrity and confidentiality. …
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Remediation
Within 24 hours: Identify all systems running OpenClaw and document current versions; disable or restrict external webhook endpoints if operationally feasible pending patching. Within 7 days: Implement network-level rate limiting on webhook endpoints independent of application logic; review webhook processing logs for suspicious patterns or forged payloads; enable additional authentication layers (IP whitelisting, mutual TLS, signed request validation) on webhook receivers. …
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External POC / Exploit Code
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