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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.

PUBLISHED Reserved 2026-04-04 | Published 2026-04-09 | Updated 2026-04-10 | Assigner VulnCheck




MEDIUM: 6.3CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

MEDIUM: 4.8CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Problem types

CWE-307 Improper Restriction of Excessive Authentication Attempts

Product status

Default status
unaffected

Any version before 2026.3.25
affected

2026.3.25 (semver)
unaffected

Credits

Peng Zhou (@zpbrent) reporter

References

github.com/...enclaw/security/advisories/GHSA-mf5g-6r6f-ghhm (GitHub Security Advisory (GHSA-mf5g-6r6f-ghhm)) third-party-advisory

github.com/...ommit/0b4d07337467f4d40a0cc1ced83d45ceaec0863c (Patch Commit) patch

www.vulncheck.com/...imit-bypass-in-webhook-token-validation (VulnCheck Advisory: OpenClaw < 2026.3.25 - Pre-Authentication Rate-Limit Bypass in Webhook Token Validation) third-party-advisory

cve.org (CVE-2026-35646)

nvd.nist.gov (CVE-2026-35646)

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