Executive Summary

CVE-2026-53866 is an allowlist bypass vulnerability in OpenClaw versions before 2026.5.12. It occurs in the shell inline-command parsing feature, where a specific parser case fails to enforce the expected allowlist check. This flaw allows authenticated operators to execute shell commands that are not approved by the allowlist, bypassing intended security approval prompts.

Essentially, the vulnerability lets certain shell commands run without proper authorization, due to missing or incomplete authorization checks in the command parsing logic.

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Impact Analysis

This vulnerability can have significant security impacts by allowing authenticated operators to execute unapproved shell commands without triggering approval prompts. This bypass of security controls can lead to unauthorized command execution, potentially compromising system integrity and security.

Because the vulnerability allows bypassing allowlist enforcement, attackers or malicious insiders with some level of access could perform actions beyond their intended permissions, increasing the risk of system misuse or compromise.

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Mitigation Strategies

To mitigate the vulnerability in OpenClaw before version 2026.5.12, you should apply the following immediate steps:

• Approve shell inline-command forms manually until the patched version is applied.
• Keep channel and tool allowlists as narrow as possible to reduce exposure.
• Avoid sharing Gateways between untrusted users to limit unauthorized access.
• Disable the affected shell inline-command parsing feature if it is not necessary.

Ultimately, upgrade to OpenClaw version 2026.5.12 or later where the vulnerability is patched.

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