What’s Vulnerable › Vulnerabilities

CVE-2026-85660: cli-mcp-server 0.2.5 Command Allowlist Bypass via Shell Substitution

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-04 · updated 2026-09-24
• Weakness: CWE-78

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.

Affected products

• MladenSU cli-mcp-server: through 0.2.5

References

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

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