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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (35.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.5% 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 2026.1.20
Weakness classification (CWE)
References
- github.com/openclaw/openclaw/security/advisories/GHSA-mr32-vwc2-5j6h (vendor-advisory, Vendor Advisory)
- github.com/openclaw/openclaw/commit/a1e89afcc19efd641c02b24d66d689f181ae2b5c (Patch, patch)
- www.vulncheck.com/advisories/openclaw-missing-authentication-in-browser-relay-c… (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.