CVE-2026-85660CWE-78command-injection

CVE-2026-85660

High · published September 4, 2026

CVSS v3.1
8.1
EPSS
1%
Percentile
49.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
9.2 · 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
EPSS
0.00622 · 49.2th percentile
Weakness
CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Published
2026-09-04T19:17Z
References (5)
https://github.com/MladenSU/cli-mcp-server · [email protected]https://github.com/MladenSU/cli-mcp-server/blob/main/src/cli_mcp_server/server.py · [email protected]https://github.com/MladenSU/cli-mcp-server/issues/17 · [email protected]https://www.vulncheck.com/advisories/cli-mcp-server-0.2.5-command-allowlist-bypass-via-shell-substitution · [email protected]https://github.com/MladenSU/cli-mcp-server/issues/17 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 06 SEP 03:33Z
    EPSS moved — → 0%
    epss
  • 04 SEP 14:32Z
    cli-mcp-server 0.2.5 Command Allowlist Bypass via Shell Substitution
    cvelistv5