CVE-2026-55604
@arikusi/deepseek-mcp-server has an Authorization Bypass Through User-Controlled Key
CVSS Score
8.6
EPSS Score
0.2%
EPSS Percentile
13th
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.
| CWE | CWE-639 |
| Vendor | arikusi |
| Product | deepseek-mcp-server |
| Published | Jul 9, 2026 |
| Last Updated | Jul 10, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
Low
Affected Versions
arikusi / deepseek-mcp-server
>= 1.4.2, < 1.7.0