What is CVE-2026-28458?

CVE-2026-28458 is a high-severity vulnerability in Openclaw, classified under Missing Authentication for Critical Function. CVSS score: 8.1/10. Published 2026-03-05.

How severe is CVE-2026-28458?

High severity. CVSS v3 base score is 8.1 out of 10.

Auth bypass in Openclaw

CVE-2026-28458

OpenClaw version 2026.1.20 prior to 2026.2.1 contains a vulnerability in the Browser Relay (extension must be installed and enabled) /cdp WebSocket endpoint in which it does not require authentication tokens, allowing websites to connect via loopback and access sensitive data. Attackers can exploit this by connecting to ws://127.0.0.1:18792/cdp to steal session cookies and execute JavaScript in other browser tabs.

Vulnerability class: Broken Authentication

EPSS: 0.003 (21.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.

Affected products

Openclaw — versions 2026.1.20

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

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

Frequently asked questions

What is CVE-2026-28458?: CVE-2026-28458 is a high-severity vulnerability in Openclaw, classified under Missing Authentication for Critical Function. CVSS score: 8.1/10. Published 2026-03-05.
How severe is CVE-2026-28458?: High severity. CVSS v3 base score is 8.1 out of 10.