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Vulnerability record · CVE-2026-85660 · published 4 September 2026

CVE-2026-85660: OS command injection vulnerability

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 4.0 Critical EPSS 0.62% · top 52.3% CWE-78 · OS command injection Deferred
9.2CVSS 4.0 base score
0.62%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
24 Sep 2026Last modified by NVD

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.

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:

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-85660), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.