EUVD-2026-9916

Comprehensive Technical Analysis of EUVD-2026-9916

1. Vulnerability Assessment and Severity Evaluation

The vulnerability in OpenClaw versions prior to 2026.2.2 is classified as an exec approvals allowlist bypass vulnerability. This flaw allows attackers to execute arbitrary commands by injecting command substitution syntax, effectively bypassing the allowlist protection. The Base Score of 9.2, according to CVSS 4.0, indicates a critical severity level. The vector string CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N highlights the following characteristics:

• Attack Vector (AV): Network (N) - The vulnerability can be exploited remotely over the network.
• Attack Complexity (AC): Low (L) - The attack requires minimal skill or resources.
• Attack Technique (AT): Physical (P) - The attack requires physical access or interaction.
• Privileges Required (PR): None (N) - No special privileges are needed to exploit the vulnerability.
• User Interaction (UI): None (N) - No user interaction is required.
• Confidentiality Impact (VC): High (H) - The vulnerability can lead to significant loss of confidentiality.
• Integrity Impact (VI): High (H) - The vulnerability can lead to significant loss of integrity.
• Availability Impact (VA): High (H) - The vulnerability can lead to significant loss of availability.
• Scope Change (SC): None (N) - The vulnerability does not change the security scope.
• Secondary Impacts (SI): None (N) - There are no secondary impacts.
• Secondary Availability (SA): None (N) - There are no secondary availability impacts.

2. Potential Attack Vectors and Exploitation Methods

Attackers can exploit this vulnerability by embedding unescaped $() or backticks inside double-quoted strings, which allows them to execute unauthorized commands. This can be achieved through various means, including:

• Remote Command Injection: Attackers can send crafted input to the application, which processes the input and executes the embedded commands.
• Malicious Input: Attackers can inject malicious input into forms, URLs, or other input fields that are processed by the vulnerable application.
• Script Injection: Attackers can inject scripts that contain command substitution syntax, leading to the execution of arbitrary commands.

3. Affected Systems and Software Versions

The vulnerability affects OpenClaw versions prior to 2026.2.2. Organizations and individuals using these versions are at risk and should prioritize updating to the latest version to mitigate the risk.

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following strategies are recommended:

• Update to the Latest Version: Upgrade to OpenClaw version 2026.2.2 or later, which includes the necessary security patches.
• Input Validation and Sanitization: Implement robust input validation and sanitization mechanisms to prevent the injection of malicious commands.
• Least Privilege Principle: Ensure that the application runs with the least privileges necessary to minimize the impact of a successful exploit.
• Monitoring and Logging: Enable comprehensive monitoring and logging to detect and respond to any suspicious activities.
• Regular Security Audits: Conduct regular security audits and vulnerability assessments to identify and address potential security weaknesses.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to the European cybersecurity landscape, particularly for organizations and individuals relying on OpenClaw for their operations. The high severity score and the potential for remote exploitation make it a critical concern. Organizations must prioritize patching and implementing robust security measures to protect against potential attacks.

6. Technical Details for Security Professionals

• Vulnerability Type: Command Injection
• Affected Component: Exec approvals allowlist
• Exploitation Method: Embedding unescaped $() or backticks inside double-quoted strings
• Mitigation: Upgrade to OpenClaw version 2026.2.2 or later
• References:
  • GitHub Security Advisory
  • GitHub Commit
  • VulnCheck Advisory

Conclusion

The exec approvals allowlist bypass vulnerability in OpenClaw versions prior to 2026.2.2 is a critical security concern that requires immediate attention. Organizations should prioritize updating to the latest version and implementing robust security measures to mitigate the risk. The potential for remote exploitation and the high impact on confidentiality, integrity, and availability make this vulnerability a significant threat to the European cybersecurity landscape.