Vulnerability in Openclaw
CVE-2026-33580
OpenClaw before 2026.3.28 contains a missing rate limiting vulnerability in the Nextcloud Talk webhook authentication that allows attackers to brute-force weak shared secrets. Attackers who can reach the webhook endpoint can exploit this to forge inbound webhook events by repeatedly attempting authentication without throttling.
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 (34.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.001
Affected products
- Openclaw — versions 0, 2026.3.28
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-9528-x887-j2fp) (vendor-advisory, third-party-advisory, Vendor Advisory)
- Patch Commit (Patch, patch)
- VulnCheck Advisory: OpenClaw < 2026.3.28 - Brute Force Attack via Missing Rate Limiting on Webhook Shared Secret Authentication (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-33580?
- CVE-2026-33580 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-2026-33580?
- Medium severity. CVSS v3 base score is 6.5 out of 10.