What’s Vulnerable › Vulnerabilities

CVE-2026-35646: OpenClaw < 2026.3.25 - Pre-Authentication Rate-Limit Bypass in Webhook Token Validation

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-09 · updated 2026-06-17
• Weakness: CWE-307

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.

Affected products

• OpenClaw: before 2026.3.25 — fixed in 2026.3.25

How to fix

Upgrade to a fixed version: OpenClaw 2026.3.25. Check the vendor advisory for mitigations.

References

• https://github.com/openclaw/openclaw/commit/0b4d07337467f4d40a0cc1ced83d45ceaec0863c
• https://github.com/openclaw/openclaw/security/advisories/GHSA-mf5g-6r6f-ghhm
• https://www.vulncheck.com/advisories/openclaw-pre-authentication-rate-limit-bypass-in-webhook-token-validation

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