What is CVE-2026-53821?

CVE-2026-53821 is a high-severity vulnerability in Openclaw, classified under Missing Authorization. CVSS score: 8.8/10. Published 2026-06-12.

How severe is CVE-2026-53821?

High severity. CVSS v3 base score is 8.8 out of 10.

Auth bypass in Openclaw

CVE-2026-53821

OpenClaw before 2026.5.18 accepts WebSocket client-declared operator scopes before binding to server-approved pairing or trusted-proxy authorization baseline. Unpaired or restricted trusted-proxy Control UI clients can obtain cached operat…

Vulnerability class: Broken Access Control

EPSS: 0.003 (21.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Openclaw — versions 0, 2026.5.18

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

disclosure@vulncheck.com (vendor-advisory, Mitigation, Vendor Advisory)
disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-53821?: CVE-2026-53821 is a high-severity vulnerability in Openclaw, classified under Missing Authorization. CVSS score: 8.8/10. Published 2026-06-12.
How severe is CVE-2026-53821?: High severity. CVSS v3 base score is 8.8 out of 10.