{"id":"CVE-2026-108953","title":"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","summary":"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…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-78"],"vendor":"cfdude","product":"mac-shell-mcp","affected":["mac-shell-mcp < 2.0.0"],"published":"2026-10-12","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:18:44.867","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-108953","references":[{"url":"https://github.com/cfdude/mac-shell-mcp","label":"disclosure@vulncheck.com"},{"url":"https://github.com/cfdude/mac-shell-mcp/blob/1c1708201abb7a18c83075e1bf933e7a92cbeb9f/src/services/command-service.ts#L257-L340","label":"disclosure@vulncheck.com"},{"url":"https://github.com/cfdude/mac-shell-mcp/commit/932ce733cde07bb30b1f186303e6692dbb5d087a","label":"disclosure@vulncheck.com"},{"url":"https://github.com/cfdude/mac-shell-mcp/issues/45","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/mac-shell-mcp-before-2.0.0-os-command-injection-via-execute-command-arguments","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"epss":0.00749,"epssPercentile":0.54734,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-13T16:40:52.381818Z"},"ingestedAt":"2026-10-12T14:50:34.109Z","slug":"CVE-2026-108953","body":"## Overview\n\nmac-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}