CVE-2026-85660

critical · 9.2

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.

9.2

CVSS

0.6%

EPSS (exploit prob.)

50th

EPSS percentile

2026-09-04

Published

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-78

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-85660