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

CVSS 3.1 5.0 MEDIUMCheck source for fixed versionsKEV status unknown

cve-program · CVE-2026-77518

Published

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.

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CVE-2026-77518 · CVE overview and exploitation status

cve-program · CVE-2026-77518

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Sources read 13 Nov 03:01 UTC · 274 of 275 readable · 272 fully read · documentation 469/469 current