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.

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.

EPSS: 0.004 (29.1th percentile) — read the EPSS interpretation.

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.

Affected products

Openclaw — versions 0, 2026.3.28

Weakness classification (CWE)

CWE-307 — Improper Restriction of Excessive Authentication Attempts

References

disclosure@vulncheck.com (vendor-advisory, Vendor Advisory, third-party-advisory)
disclosure@vulncheck.com (Patch, patch)
disclosure@vulncheck.com (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.