CVE-2026-55157 — Token Optimizer MCP: OS command injection in smart_user via username in get-user-info
Token Optimizer MCP measures token savings per AI coding agent, optimizes context, and shares a live local knowledge graph across 16 CLI clients. Prior to version 5.1.0, token-o…
Published: 2026-09-28 · CVSS: 8.4 · CVSS 3.1
Token Optimizer MCP measures token savings per AI coding agent, optimizes context, and shares a live local knowledge graph across 16 CLI clients. Prior to version 5.1.0, token-optimizer-mcp is vulnerable to OS command injection in the smart_user tool. Any MCP client that can call the smart_user tool can execute arbitrary shell commands through the username argument of the get-user-info operation. The commands execute with the privileges of the user running the token-optimizer-mcp server. This issue has been patched in version 5.1.0.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7