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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55157
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-28 18:17:23 UTC
Updated2026-10-01 15:17:30 UTC
DescriptionToken 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.

Risk And Classification

Primary CVSS: v3.1 8.4 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.007050000 probability, percentile 0.514690000 (date 2026-09-29)

Problem Types: CWE-78 | CWE-78 CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Ooples Token-optimizer-mcp affected < 5.1.0 Not specified

References

ReferenceSourceLinkTags
github.com/ooples/token-optimizer-mcp/commit/b4ee96dac799cbfba0a9f9c1784... [email protected] github.com
github.com/ooples/token-optimizer-mcp/security/advisories/GHSA-49mq-fc6q... 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/ooples/token-optimizer-mcp/releases/tag/v5.1.0 [email protected] github.com
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