CVE-2026-35646

OpenClaw < 2026.3.25 - Pre-Authentication Rate-Limit Bypass in Webhook Token Validation

State: Published
Severity: 6.3 Medium
Published: Apr 9, 2026
Updated: Jun 23, 2026
Reserved: Apr 4, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.3 Medium	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	VulnCheck
3.1	4.8 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N	VulnCheck

Weaknesses

CWE-307 Improper Restriction of Excessive Authentication Attempts

Affected Products

Product	Versions
OpenClawOpenClaw	before 2026.3.25Affected 2026.3.25Not affected

References

GitHub Security Advisory (GHSA-mf5g-6r6f-ghhm)vendor-advisory
Patch Commitpatch
VulnCheck Advisory: OpenClaw < 2026.3.25 - Pre-Authentication Rate-Limit Bypass in Webhook Token Validationthird-party-advisory

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