Executive Summary

CVE-2026-53861 is an allowlist bypass vulnerability in OpenClaw versions before 2026.5.6 affecting the macOS Swift exec feature. The vulnerability arises because the allowlist check misses combined POSIX inline-command flags, allowing attackers to execute shell commands outside the intended restrictions.

This means that by using combined flag forms, an attacker can bypass the security controls designed to restrict command execution, potentially running unauthorized commands depending on how the operator has configured the system.

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Impact Analysis

This vulnerability can lead to unauthorized command execution on affected systems, which may compromise the confidentiality and integrity of data.

The CVSS scores indicate a moderate severity with potential high impact on confidentiality and integrity but no impact on availability.

Exploitation requires local access, low complexity, low privileges, and user interaction, meaning an attacker with limited access could still leverage this flaw if conditions are met.

Depending on the operator's configuration and the presence of lower-trust input reaching the vulnerable path, attackers might execute unauthorized shell commands, potentially leading to data exposure or manipulation.

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Mitigation Strategies

To mitigate the vulnerability in OpenClaw before version 2026.5.6, you should upgrade to version 2026.5.6 or later where the issue is fixed.

• Restrict channel and tool allowlists to reduce exposure.
• Avoid using shared Gateways for untrusted users.
• Disable the macOS Swift exec feature if it is not necessary.

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