CVE-2026-28468 Overview
CVE-2026-28468 is an Authentication Bypass vulnerability affecting OpenClaw versions 2026.1.29-beta.1 prior to 2026.2.14. The vulnerability exists in the sandbox browser bridge server component, which improperly accepts requests without requiring gateway authentication. This security flaw allows local attackers to access browser control endpoints without proper authorization.
A local attacker exploiting this vulnerability can enumerate browser tabs, retrieve WebSocket URLs, execute arbitrary JavaScript code, and exfiltrate cookies and session data from authenticated browser contexts. The vulnerability is classified under CWE-306 (Missing Authentication for Critical Function).
Critical Impact
Local attackers can bypass authentication to access browser control endpoints, enabling JavaScript execution, cookie theft, and session data exfiltration from authenticated browser sessions.
Affected Products
- OpenClaw versions 2026.1.29-beta.1 through 2026.2.13
- OpenClaw sandbox browser bridge server component
- Systems running vulnerable OpenClaw beta releases
Discovery Timeline
- 2026-03-05 - CVE-2026-28468 published to NVD
- 2026-03-05 - Last updated in NVD database
Technical Details for CVE-2026-28468
Vulnerability Analysis
This vulnerability stems from a missing authentication mechanism in the sandbox browser bridge server component of OpenClaw. The browser bridge server is designed to facilitate communication between the sandbox environment and browser instances. However, in affected versions, the server accepts incoming requests to browser control endpoints without validating that the requester has been authenticated through the gateway.
The impact of this vulnerability is significant because it provides local attackers with the ability to interact directly with browser instances running in authenticated contexts. An attacker can leverage this access to enumerate open browser tabs, obtain WebSocket connection URLs for real-time browser communication, inject and execute arbitrary JavaScript within the browser context, and extract sensitive authentication materials including cookies and session tokens.
Root Cause
The root cause is CWE-306: Missing Authentication for Critical Function. The sandbox browser bridge server was implemented without proper authentication checks on its control endpoints. When processing incoming requests, the server fails to verify that the requester has authenticated through the appropriate gateway mechanism before granting access to sensitive browser control functionality.
Attack Vector
This vulnerability requires local access to exploit. An attacker with local access to the system running a vulnerable OpenClaw instance can directly communicate with the sandbox browser bridge server endpoints. The attack does not require any user interaction or special privileges.
The attacker can connect to the browser bridge server and issue commands to enumerate active browser tabs, retrieve WebSocket URLs that provide direct communication channels to browser instances, execute JavaScript code within the browser context, and exfiltrate authentication credentials including cookies and session data from users who have authenticated within the browser.
The vulnerability mechanism involves direct communication with the unprotected browser bridge server endpoints. Technical details and patch commits are available in the GitHub Security Advisory.
Detection Methods for CVE-2026-28468
Indicators of Compromise
- Unusual local connections to the sandbox browser bridge server from unexpected processes
- Unexpected JavaScript execution or browser automation activity in sandbox environments
- Anomalous access to browser cookies or session storage by non-browser processes
- WebSocket connections to browser debugging endpoints from unauthorized sources
Detection Strategies
- Monitor local network traffic for connections to sandbox browser bridge server ports from non-standard processes
- Implement process monitoring to detect unauthorized access to browser control interfaces
- Deploy endpoint detection rules to identify cookie or session data access by unexpected applications
- Review application logs for authentication bypass attempts or missing authentication tokens
Monitoring Recommendations
- Enable verbose logging on OpenClaw sandbox browser bridge server components
- Monitor for unauthorized WebSocket connections to browser instances
- Implement alerting on JavaScript execution from non-whitelisted sources within sandbox environments
- Track cookie and session data access patterns for anomalous behavior
How to Mitigate CVE-2026-28468
Immediate Actions Required
- Upgrade OpenClaw to version 2026.2.14 or later immediately
- Audit systems for any signs of exploitation or unauthorized browser access
- Review and restrict local access to systems running vulnerable OpenClaw instances
- Implement network segmentation to limit local attack surface where possible
Patch Information
OpenClaw has released security patches to address this vulnerability. The fix adds proper gateway authentication requirements to the sandbox browser bridge server endpoints. Multiple commits have been published to remediate this issue:
For complete details, refer to the GitHub Security Advisory and the VulnCheck Advisory.
Workarounds
- Restrict local access to systems running OpenClaw to trusted users only until patching is complete
- Implement host-based firewall rules to limit access to sandbox browser bridge server ports
- Monitor and log all local connections to OpenClaw components for forensic purposes
- Consider temporarily disabling the sandbox browser bridge functionality if not critical to operations
# Example: Restrict local access to browser bridge port (adjust port as needed)
# Using iptables to limit localhost connections
iptables -A INPUT -p tcp --dport 9222 -s 127.0.0.1 -j DROP
# Note: Verify the actual port used by your OpenClaw installation
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
