CVE-2026-108953CWE-78command-injection

CVE-2026-108953

High · published October 12, 2026

CVSS v3.1
7.8
EPSS
1%
Percentile
54.4
In the wild
Unconfirmed
What it is

mac-shell-mcp before 2.0.0 contains an OS command injection vulnerability that allows MCP clients to bypass the command whitelist by injecting shell metacharacters into execute_command arguments. Attackers or malicious prompts can call a safe command such as pwd with arguments like ';' to run forbidden commands as the server user without approval.

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
8.5 · CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00749 · 54.4th percentile
Weakness
CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Published
2026-10-12T17:17Z
References (5)
https://github.com/cfdude/mac-shell-mcp · [email protected]https://github.com/cfdude/mac-shell-mcp/blob/1c1708201abb7a18c83075e1bf933e7a92cbeb9f/src/services/command-service.ts#L257-L340 · [email protected]https://github.com/cfdude/mac-shell-mcp/commit/932ce733cde07bb30b1f186303e6692dbb5d087a · [email protected]https://github.com/cfdude/mac-shell-mcp/issues/45 · [email protected]https://www.vulncheck.com/advisories/mac-shell-mcp-before-2.0.0-os-command-injection-via-execute-command-arguments · [email protected]
EPSS history
Timeline
  • 14 OCT 03:27Z
    EPSS moved — → 1%
    epss
  • 12 OCT 12:13Z
    mac-shell-mcp before 2.0.0 OS Command Injection via execute_command Arguments
    cvelistv5
  • 12 OCT 12:13Z
    mac-shell-mcp before 2.0.0 OS Command Injection via execute_command Arguments
    cvelistv5