CVE-2026-54149CWE-78

MaxKB MCP tool import validation bypass allows post-authentication remote code execution

High · published July 10, 2026

CVSS v3.1
8.8
EPSS
1%
Percentile
45.2
In the wild
Unconfirmed
What it is

MaxKB is an open-source AI assistant for enterprise. Prior to 2.10.0-lts, MaxKB tool import functionality in apps/tools/serializers/tool.py and MCP referencing mode in apps/application/chat_pipeline/step/chat_step/impl/base_chat_step.py do not consistently validate MCP transport type, allowing an authenticated user to import a .tool file containing stdio transport with malicious commands and trigger the configuration through an AI Chat node so MultiServerMCPClient executes arbitrary system commands. This issue is fixed in version 2.10.0-lts.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00549 · 45.2th percentile
Weakness
CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Published
2026-07-10T15:05Z
EPSS history
Timeline
  • 10 JUL 15:05Z
    MaxKB MCP tool import validation bypass allows post-authentication remote code execution
    cvelistv5