CVE-2026-77518

MaxKB: Known MCP tool IDs expose owner Tool.code and can be referenced by attacker workflows

Published 21 Sep 2026 • Updated 21 Sep 2026

Severity: MEDIUM

Description

MaxKB is an open-source AI assistant for enterprise. In 2.10.2-lts and earlier, a normal workspace user who knows another user's active MCP tool_id in the same workspace can retrieve the hidden tool through the tool-detail route because it does not apply the per-resource authorization used by the list route. The response includes Tool.code, which may contain MCP server configuration and headers, and an attacker who can create or edit an attacker-owned workflow can place the same foreign mcp_tool_id in a workflow mcp-node so workflow debug uses the owner's MCP configuration without verifying permission to use that tool. No fixed version is available as of this review.

Affected products (1)

• 1Panel-dev MaxKB

Problem types

• CWE-862: Missing Authorization

References (1)

• https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-x65c-w438-c58f