What’s Vulnerable › Vulnerabilities

CVE-2026-55157: Token Optimizer MCP: OS command injection in smart_user via username in get-user-info

• Severity: high (CVSS 8.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-28 · updated 2026-10-01
• Weakness: CWE-78

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.

Affected products

• ooples token-optimizer-mcp: before 5.1.0

References

• https://github.com/ooples/token-optimizer-mcp/commit/b4ee96dac799cbfba0a9f9c17844ce9d613cbcc7
• https://github.com/ooples/token-optimizer-mcp/releases/tag/v5.1.0
• https://github.com/ooples/token-optimizer-mcp/security/advisories/GHSA-49mq-fc6q-3h46
• https://github.com/ooples/token-optimizer-mcp/security/advisories/GHSA-49mq-fc6q-3h46

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