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CVE-2026-85660

8.1 · HIGH

cli-mcp-server 0.2.5 contains a command allowlist bypass vulnerability in the _validate_command_with_operators function when ALLOW_SHELL_OPERATORS is enabled.

Published Sep 4, 2026CWE-78EPSS 0.62%

Overview

CVE-2026-85660 is a high-severity vulnerability. It was published on September 4, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

cli-mcp-server 0.2.5 contains a command allowlist bypass vulnerability in the _validate_command_with_operators function when ALLOW_SHELL_OPERATORS is enabled. Attackers can use shell command substitution syntax like $(...) or backticks to execute non-allowlisted commands that bypass the ALLOWED_COMMANDS validation check.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/MladenSU/cli-mcp-serverGitHubgithub.com/MladenSU/cli-mcp-server/blob/main/src/cli_mcp_server/server.pyGitHubgithub.com/MladenSU/cli-mcp-server/issues/17Refwww.vulncheck.com/advisories/cli-mcp-server-0.2.5-command-allowlist-bypass-via-shell-substitutionGitHubgithub.com/MladenSU/cli-mcp-server/issues/17

How CyberStrike helps

Frequently asked questions

What is CVE-2026-85660?

CVE-2026-85660 is a high-severity vulnerability. It was published on September 4, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-85660?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-85660?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-85660?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-85660 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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