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Description

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.

PUBLISHED Reserved 2026-02-27 | Published 2026-03-05 | Updated 2026-03-09 | Assigner VulnCheck




HIGH: 7.4CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

HIGH: 8.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Problem types

Missing Authentication for Critical Function

Product status

Default status
unaffected

2026.1.20 (custom) before 2026.2.1
affected

Credits

@johnatzeropath finder

@LeftenantZero finder

Yue (Knox) Liu (@yueyueL) finder

References

github.com/...enclaw/security/advisories/GHSA-mr32-vwc2-5j6h (GitHub Security Advisory (GHSA-mr32-vwc2-5j6h)) vendor-advisory

github.com/...ommit/a1e89afcc19efd641c02b24d66d689f181ae2b5c (Patch Commit) patch

www.vulncheck.com/...in-browser-relay-cdp-websocket-endpoint (VulnCheck Advisory: OpenClaw 2026.1.20 < 2026.2.1 - Missing Authentication in Browser Relay /cdp WebSocket Endpoint) third-party-advisory

cve.org (CVE-2026-28458)

nvd.nist.gov (CVE-2026-28458)

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