Vulnerability in Openclaw
CVE-2026-34505
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (26.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Openclaw — versions 0, 2026.3.12
Weakness classification (CWE)
References
- github.com/openclaw/openclaw/security/advisories/GHSA-5m9r-p9g7-679c (vendor-advisory, Vendor Advisory, third-party-advisory)
- www.vulncheck.com/advisories/openclaw-webhook-rate-limiting-bypass-via-pre-auth… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-34505?
- CVE-2026-34505 is a medium-severity vulnerability in Openclaw, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 6.5/10. Published 2026-03-31.
- How severe is CVE-2026-34505?
- Medium severity. CVSS v3 base score is 6.5 out of 10.