Authorization Bypass Through User-Controlled Key

Overview @arikusi/deepseek-mcp-server is a MCP Server for DeepSeek API integration - enables Claude Code to use DeepSeek Chat and Reasoner models Affected versions of this package are vulnerable to Authorization Bypass Through User-Controlled Key in the SessionStore process, which accepts...

CVE-2026-55604

DeepSeek MCP Server (DeepSeek V4) is vulnerable from v1.4.2 up to, but not including, v1.7.0. The issue stems from a process-global SessionStore that accepts caller-supplied session_id values without binding them to any authenticated principal or transport session. An attacker can enumerate activ...

CVE-2026-55604 @arikusi/deepseek-mcp-server has an Authorization Bypass Through User-Controlled Key

DeepSeek MCP Server is an MCP server for DeepSeek V4. Starting in version 1.4.2 and prior to version 1.7.0, the process-global SessionStore accepts caller-supplied sessionid values without binding them to any authenticated principal or transport session. An attacker can enumerate active session I...

CVE-2026-55605 @arikusi/deepseek-mcp-server Missing Authentication on Self-Hosted HTTP MCP Endpoint

DeepSeek MCP Server is an MCP server for DeepSeek V4. Starting in version 1.4.2 and prior to version 1.8.0, the self-hosted HTTP transport of @arikusi/deepseek-mcp-server exposes POST /mcp without any authentication: createMcpExpressApp is called without an authProvider and no middleware guards t...

CVE-2026-55605

Summary: CVE-2026-55605 affects the self-hosted HTTP transport of @arikusi/deepseek-mcp-server used with DeepSeek V4. starting in 1.4.2 and before 1.8.0, the POST /mcp endpoint is exposed without authentication due to createMcpExpressApp being called without an authProvider and missing route guar...