Authorization Bypass Through User-Controlled Key Affecting @arikusi/deepseek-mcp-server package, versions >=1.4.2 <1.7.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published12 Jul 2026
- disclosed10 Jul 2026
- creditUnknown
Introduced: 10 Jul 2026
NewCVE-2026-55604 (opens in a new tab)How to fix?
Upgrade @arikusi/deepseek-mcp-server to version 1.7.0 or higher.
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 caller-supplied session_id values without associating them with an authenticated principal or transport session. An attacker can enumerate active session IDs via deepseek_sessions and reuse a victim-controlled session_id in deepseek_chat to access and continue the victim's conversation context.