OpenClaw versions prior to 2026.2.21 sandbox browser entrypoint launches x11vnc without authentication for noVNC observer sessions, allowing unauthenticated access to the VNC interface. Remote attackers on the host loopback interface can connect to the exposed noVNC port to observe or interact with the sandbox browser without credentials.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Openclaw Openclaw
cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:*
|
— |
2026.2.21
|
References 4
https://github.com/openclaw/openclaw/commit/621d8e1312482f122f18c43c72c67211b14…
disclosure@vulncheck.com
https://github.com/openclaw/openclaw/commit/8c1518f0f3e0533593cd2dec3a46c9b7467…
disclosure@vulncheck.com
https://github.com/openclaw/openclaw/security/advisories/GHSA-25gx-x37c-7pph
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/openclaw-missing-vnc-authentication-in-san…
disclosure@vulncheck.com