CVE-2026-55157CWE-78command-injection

CVE-2026-55157

High · published September 28, 2026

CVSS v3.1
8.4
EPSS
1%
Percentile
52.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.4 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00705 · 52.8th percentile
Weakness
CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Published
2026-09-28T22:17Z
References (4)
https://github.com/ooples/token-optimizer-mcp/commit/b4ee96dac799cbfba0a9f9c17844ce9d613cbcc7 · [email protected]https://github.com/ooples/token-optimizer-mcp/releases/tag/v5.1.0 · [email protected]https://github.com/ooples/token-optimizer-mcp/security/advisories/GHSA-49mq-fc6q-3h46 · [email protected]https://github.com/ooples/token-optimizer-mcp/security/advisories/GHSA-49mq-fc6q-3h46 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 30 SEP 03:27Z
    EPSS moved — → 1%
    epss
  • 28 SEP 17:48Z
    Token Optimizer MCP: OS command injection in smart_user via username in get-user-info
    cvelistv5