GHSA-647h-p824-99w7: @grackle-ai/mcp has a workspace authorization bypass in its knowledge_search MCP tool

The knowledge_search and knowledge_get_node MCP tools are included in SCOPED_TOOLS (visible to scoped agents) but their handlers do not receive authContext and do not enforce workspace scoping. A scoped agent in Workspace A can supply an arbitrary workspaceId parameter to search or retrieve knowledge graph nodes from Workspace B, bypassing workspace isolation boundaries.

This is a cross-workspace data leakage vulnerability affecting any deployment where multiple workspaces contain sensitive knowledge graph data and scoped agents are used.

Affected code:

• packages/mcp/src/tools/knowledge.ts:146-169 (knowledge_search handler)
• packages/mcp/src/tools/knowledge.ts:244-283 (knowledge_get_node handler)
• packages/mcp/src/tool-scoping.ts:11 (both tools listed in SCOPED_TOOLS)

Contrast with correct implementation: knowledge_create_node (same file, lines 334-357) properly receives authContext and overrides the user-supplied workspaceId for scoped callers.