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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 `session_id` values without binding them to any authenticated principal or transport session. An attacker can enumerate active session IDs via `deepseek_sessions`, then reuse a victim-controlled `session_id` in `deepseek_chat` to retrieve and continue the victim's conversation context. Version 1.7.0 contains a patch.
8.6 HIGHEPSS 0.37%Not in KEVNVD: Deferred
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 8.6 | HIGH | 3.1GitHub_M (CNA) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L |
Details
- CVE ID
- CVE-2026-55604
- Status
- Deferred
- Assigner (CNA)
- GitHub_M
- Published
- Jul 9, 2026
- Last modified
- 2026-10-25 17:10 UTC
- Weaknesses
- CWE-639 · Authorization Bypass Through User-Controlled Key
Affected Products
As published by the CNA in the CVE record.
arikusideepseek-mcp-server1 version range
- >= 1.4.2, < 1.7.0