GHSA-MR32-VWC2-5J6H
Vulnerability from github – Published: 2026-02-17 16:45 – Updated: 2026-02-17 16:45Summary
In affected versions, the Browser Relay /cdp WebSocket endpoint did not require an authentication token. As a result, a website running in the browser could potentially connect to the local relay (via loopback WebSocket) and use CDP to access cookies from other open tabs and run JavaScript in the context of other tabs.
Affected Packages / Versions
- npm:
openclaw>= 2026.1.20, < 2026.2.1 - npm:
moltbot<= 0.1.0
Details
The Chrome extension Browser Relay service exposes a local WebSocket endpoint at ws://127.0.0.1:18792/cdp (default port) for forwarding Chrome DevTools Protocol (CDP) messages.
In affected versions, the /cdp upgrade path verified the TCP peer was loopback but did not require a shared secret and did not block browser-initiated cross-origin requests.
Impact
- Potential disclosure of sensitive information (for example, session cookies from other open tabs)
- Potential JavaScript execution in the context of other open tabs
Users must have the Browser Relay extension installed and active, and must visit an untrusted site.
Fix
openclaw now requires a per-instance shared secret header for Browser Relay access:
- HTTP header: x-openclaw-relay-token
It also rejects /cdp WebSocket upgrades when the Origin header is present but is not chrome-extension://..., and refuses /cdp connections unless the extension is connected.
Fix Commit(s)
a1e89afcc19efd641c02b24d66d689f181ae2b5c
Releases
openclaw@2026.2.1includes the fix.- Latest published
openclawat time of writing:2026.2.13.
Mitigation
- Update to
openclaw@>= 2026.2.1. - If you cannot update immediately, disable the Browser Relay extension / relay server and avoid visiting untrusted sites.
Thanks @johnatzeropath, @LeftenantZero, and @yueyueL for reporting.
{
"affected": [
{
"package": {
"ecosystem": "npm",
"name": "openclaw"
},
"ranges": [
{
"events": [
{
"introduced": "2026.1.20"
},
{
"fixed": "2026.2.1"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "npm",
"name": "moltbot"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "0.1.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [],
"database_specific": {
"cwe_ids": [
"CWE-306"
],
"github_reviewed": true,
"github_reviewed_at": "2026-02-17T16:45:47Z",
"nvd_published_at": null,
"severity": "HIGH"
},
"details": "### Summary\nIn affected versions, the Browser Relay `/cdp` WebSocket endpoint did not require an authentication token. As a result, a website running in the browser could potentially connect to the local relay (via loopback WebSocket) and use CDP to access cookies from other open tabs and run JavaScript in the context of other tabs.\n\n### Affected Packages / Versions\n- npm: `openclaw` `\u003e= 2026.1.20, \u003c 2026.2.1`\n- npm: `moltbot` `\u003c= 0.1.0`\n\n### Details\nThe Chrome extension Browser Relay service exposes a local WebSocket endpoint at `ws://127.0.0.1:18792/cdp` (default port) for forwarding Chrome DevTools Protocol (CDP) messages.\n\nIn affected versions, the `/cdp` upgrade path verified the TCP peer was loopback but did not require a shared secret and did not block browser-initiated cross-origin requests.\n\n### Impact\n- Potential disclosure of sensitive information (for example, session cookies from other open tabs)\n- Potential JavaScript execution in the context of other open tabs\n\nUsers must have the Browser Relay extension installed and active, and must visit an untrusted site.\n\n### Fix\n`openclaw` now requires a per-instance shared secret header for Browser Relay access:\n- HTTP header: `x-openclaw-relay-token`\n\nIt also rejects `/cdp` WebSocket upgrades when the Origin header is present but is not `chrome-extension://...`, and refuses `/cdp` connections unless the extension is connected.\n\n### Fix Commit(s)\n- `a1e89afcc19efd641c02b24d66d689f181ae2b5c`\n\n### Releases\n- `openclaw@2026.2.1` includes the fix.\n- Latest published `openclaw` at time of writing: `2026.2.13`.\n\n### Mitigation\n- Update to `openclaw@\u003e= 2026.2.1`.\n- If you cannot update immediately, disable the Browser Relay extension / relay server and avoid visiting untrusted sites.\n\nThanks @johnatzeropath, @LeftenantZero, and @yueyueL for reporting.",
"id": "GHSA-mr32-vwc2-5j6h",
"modified": "2026-02-17T16:45:47Z",
"published": "2026-02-17T16:45:47Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/openclaw/openclaw/security/advisories/GHSA-mr32-vwc2-5j6h"
},
{
"type": "WEB",
"url": "https://github.com/openclaw/openclaw/commit/a1e89afcc19efd641c02b24d66d689f181ae2b5c"
},
{
"type": "PACKAGE",
"url": "https://github.com/openclaw/openclaw"
},
{
"type": "WEB",
"url": "https://github.com/openclaw/openclaw/releases/tag/v2026.2.1"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "OpenClaw\u0027s Browser Relay /cdp websocket is missing auth which could allow cross-tab cookie access"
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.