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.

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation poc

Automatable no

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
MladenSU cli-mcp-server unaffected
Version Status Constraints
0 affected ≤ 0.2.5

No data.

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Project Subscriptions

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/MladenSU/cli-mcp-server cve-icon cve-icon
https://github.com/MladenSU/cli-mcp-server/blob/main/src/cli_mcp_server/server.py cve-icon cve-icon
https://github.com/MladenSU/cli-mcp-server/issues/17 cve-icon cve-icon cve-icon
https://www.vulncheck.com/advisories/cli-mcp-server-0.2.5-command-allowlist-bypass-via-shell-substitution cve-icon cve-icon
History

Fri, 04 Sep 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Fri, 04 Sep 2026 14:45:00 +0000

Type Values Removed Values Added
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.
Title cli-mcp-server 0.2.5 Command Allowlist Bypass via Shell Substitution
Weaknesses CWE-78
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.2, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-04T17:50:30.858Z

Reserved: 2026-09-04T13:32:27.594Z

Link: CVE-2026-85660

cve-icon Vulnrichment

Updated: 2026-09-04T17:50:27.071Z

cve-icon NVD

Status : Received

Published: 2026-09-04T15:17:43.490

Modified: 2026-09-04T18:18:06.293

Link: CVE-2026-85660

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-04T16:00:05Z

Weaknesses