CVE-2026-85660
cli-mcp-server 0.2.5 Command Allowlist Bypass via Shell Substitution
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-78 |
| Vendor | mladensu |
| Product | cli-mcp-server |
| Published | Sep 4, 2026 |
| Last Updated | Sep 4, 2026 |
Stay Ahead of the Next One
Get instant alerts for mladensu cli-mcp-server
Be the first to know when new high vulnerabilities affecting mladensu cli-mcp-server are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
MladenSU / cli-mcp-server
0 ≤ 0.2.5
References
github.com: https://github.com/MladenSU/cli-mcp-server/issues/17 github.com: https://github.com/MladenSU/cli-mcp-server github.com: https://github.com/MladenSU/cli-mcp-server/blob/main/src/cli_mcp_server/server.py vulncheck.com: https://www.vulncheck.com/advisories/cli-mcp-server-0.2.5-command-allowlist-bypass-via-shell-substitution
Credits
George Chen