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CVE-2026-77518

5 MEDIUMpublic exploit available

Published 2026-09-21 · Updated 2026-09-21

AI risk analysis

Summary
An authorization bypass flaw allows a normal user to retrieve hidden tools by knowing another user's active MCP tool_id. This can expose sensitive configuration data.
Exploitability
Exploitation requires knowledge of another user’s MCP tool_id and access to the same workspace; moderately difficult.
Blast radius
If exploited, it could lead to unauthorized access to sensitive configurations and headers, impacting multiple users within the same workspace.
Prioritized remediation
Implement strict per-resource authorization checks for all API routes handling MCP tools.
auth-bypassapiconfiguration-exposureworkspace

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD 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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

Weaknesses

CWE-862

Public exploit & PoC references

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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