RCE in Mladensu Cli-Mcp-Server
CVE-2026-85660
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.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (48.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/MladenSU/cli-mcp-server (product)
- github.com/MladenSU/cli-mcp-server/blob/main/src/cli_mcp_server/server.py (technical-description)
- github.com/MladenSU/cli-mcp-server/issues/17 (issue-tracking)
- www.vulncheck.com/advisories/cli-mcp-server-0.2.5-command-allowlist-bypass-via-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-85660?
- CVE-2026-85660 is a high-severity vulnerability in Mladensu Cli-Mcp-Server, classified under OS Command Injection. CVSS score: 8.1/10. Published 2026-09-04.
- How severe is CVE-2026-85660?
- High severity. CVSS v3 base score is 8.1 out of 10.