Authorization Bypass in OpenClaw MCP Loopback Feature

Executive Summary

CVE-2026-62195 is an authorization bypass vulnerability in OpenClaw versions 2026.5.20 before 2026.6.6. The issue exists in the MCP loopback feature, which allows lower-trust callers to execute tools that are intended only for owners.

Attackers can exploit this vulnerability by using configured input paths to bypass authorization checks. This enables them to execute or persist actions that exceed their intended permissions, potentially leading to unauthorized access or control.

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Detection Guidance

Detecting this vulnerability requires checking for the presence of vulnerable OpenClaw versions (2026.5.20 before 2026.6.6) and inspecting the MCP loopback feature for unauthorized access or misconfigurations.

• Identify the installed OpenClaw version by running: `openclaw --version` or checking package manifests if installed via a package manager.
• Review MCP loopback configurations for unexpected input paths or unauthorized caller permissions. This may involve checking configuration files (e.g., `/etc/openclaw/mcp.conf`) or using administrative tools like: `openclaw mcp --check-auth`.
• Monitor network traffic for unusual calls to the MCP loopback interface, particularly from lower-trust sources. Tools like Wireshark or tcpdump can filter for MCP-specific traffic (e.g., `tcpdump -i any port <MCP_PORT>`).

Since the vulnerability involves authorization bypass, manual inspection of caller permissions and input path configurations is critical. Automated vulnerability scanners may not detect this issue without specific signatures.

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Impact Analysis

This vulnerability can impact you in several ways:

• Unauthorized execution of privileged actions: Attackers with lower trust levels can perform actions restricted to owners, leading to potential misuse of system tools or functions.
• Data breaches: If sensitive data is accessible through the owner-only tools, attackers could exfiltrate or manipulate this data.
• System compromise: The ability to persist actions beyond intended permissions may allow attackers to maintain unauthorized access or control over the system.
• Operational disruption: Unauthorized actions could disrupt normal system operations, leading to downtime or degraded performance.

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Compliance Impact

This vulnerability can affect compliance with common standards and regulations in the following ways:

• GDPR (General Data Protection Regulation): If the vulnerability leads to unauthorized access or exposure of personal data, it could result in a violation of GDPR. This may include failure to protect personal data (Article 5) or lack of appropriate security measures (Article 32).
• HIPAA (Health Insurance Portability and Accountability Act): For systems handling protected health information (PHI), this vulnerability could lead to unauthorized access or disclosure of PHI, violating the HIPAA Security Rule (45 CFR Part 164, Subpart C).
• Other standards: Depending on the industry, this vulnerability may also impact compliance with standards like PCI DSS (Payment Card Industry Data Security Standard) if payment data is involved, or ISO 27001, which requires proper access control and authorization mechanisms.

Non-compliance could result in regulatory fines, legal action, or reputational damage.

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Mitigation Strategies

Immediate mitigation steps focus on restricting access to the MCP loopback feature and upgrading to a patched version.

• Upgrade OpenClaw to version 2026.6.6 or later, as this version contains fixes for the authorization bypass vulnerability. Use the package manager or official release channels for the update.
• If upgrading is not immediately possible, restrict access to the MCP loopback interface by: 1) Disabling the feature if unused, or 2) Applying network-level controls (e.g., firewalls) to limit access to trusted sources only.
• Review and harden MCP loopback configurations to ensure input paths are strictly validated and caller permissions are enforced. Remove or disable unnecessary paths that could be exploited.
• Monitor systems for signs of exploitation, such as unauthorized execution of owner-only tools or unexpected changes to configurations. Logs from the MCP interface should be reviewed for suspicious activity.

Long-term mitigation includes implementing least-privilege access controls and regularly auditing MCP loopback configurations for compliance with security policies.

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