TI-2026-39846 Aliases CVE-2026-55157 GHSA-49mq-fc6q-3h46

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

HIGH 72CWE-78Published 2026-09-28 · Updated 2026-10-01

Key facts

Attack vector: Local
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-78.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00881 59th percentileScored 2026-11-07

Fix Fixed token-optimizer-mcp (ooples): 5.1.0@ooples/token-optimizer-mcp (npm): 5.1.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
ooples	token-optimizer-mcp	before 5.1.0	5.1.0	Patch available	CNA
—	@ooples/token-optimizer-mcp (npm)	before 5.1.0	5.1.0	Patch available	GHSA-49mq-fc6q-3h46

token-optimizer-mcp Vendorooples Affected before 5.1.0 Fixed in 5.1.0 Patch available CNA
@ooples/token-optimizer-mcp (npm) Vendor— Affected before 5.1.0 Fixed in 5.1.0 Patch available GHSA-49mq-fc6q-3h46

Remediation

Fix · CNA token-optimizer-mcp (ooples) Fixed in 5.1.0
Fix · GHSA-49mq-fc6q-3h46 @ooples/token-optimizer-mcp (npm) Fixed in 5.1.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-55157
2026-10-03 Alias added: GHSA-49mq-fc6q-3h46

References

Other 4

TI-2026-39845 Token Optimizer MCP: Unauthenticated Path Traversal in Dashboard Session Log API Endpoints CVSS 3.1MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences