CVE-2026-35646

| EUVD-2026-21144 MEDIUM
2026-04-09 VulnCheck GHSA-59xc-5v89-r7pr
6.3
CVSS 4.0
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CVSS Vector

CVSS:4.0/AV:N/AC:H/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
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
EUVD ID Assigned
Apr 09, 2026 - 21:45 euvd
EUVD-2026-21144
Analysis Generated
Apr 09, 2026 - 21:45 vuln.today
Patch Released
Apr 09, 2026 - 21:45 nvd
Patch available
CVE Published
Apr 09, 2026 - 21:27 nvd
MEDIUM 6.3

Tags

Authentication Bypass Openclaw

Description

OpenClaw before 2026.3.25 contains a pre-authentication rate-limit bypass vulnerability in webhook token validation that allows attackers to brute-force weak webhook secrets. The vulnerability exists because invalid webhook tokens are rejected without throttling repeated authentication attempts, enabling attackers to guess weak tokens through rapid successive requests.

Analysis

OpenClaw before version 2026.3.25 allows unauthenticated remote attackers to bypass pre-authentication rate limiting on webhook token validation, enabling brute-force attacks against weak webhook secrets through rapid successive requests. The vulnerability stems from absent throttling on invalid token rejection attempts, permitting attackers to enumerate valid tokens without login credentials or triggering defensive rate-limiting mechanisms.

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Priority Score

32
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +32
POC: 0

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CVE-2026-35646 vulnerability details – vuln.today
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