CVE-2026-55157
High
Description
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.
SeverityHigh
CVSS8.4
Exploit probability—
Product@ooples/token-optimizer-mcp
PublishedSep 28, 2026
First seenSep 28, 2026
Weakness typeCWE-78OS command injection
How to fix
Update
- @ooples/token-optimizer-mcp5.1.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| @ooples/token-optimizer-mcpnpm | v < 5.1.0 | 5.1.0 |
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