CVE-2026-55604

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

Published Jul 9, 2026 CVSS 3.1 · 8.6 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-fh3r-g96v-f578 @arikusi/deepseek-mcp-server has an Authorization Bypass Through User-Controlled Key
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Arikusi
Arikusi deepseek-mcp-server
Vendors & Products Arikusi
Arikusi deepseek-mcp-server
Type Values Removed Values Added
Description 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.
Title @arikusi/deepseek-mcp-server has an Authorization Bypass Through User-Controlled Key
Weaknesses CWE-639
References
Metrics cvssV3_1

{'score': 8.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jul 10, 2026, 2:42 PM
Reserved
Jun 16, 2026, 11:31 PM
Status
Deferred
Published
Jul 9, 2026, 10:17 PM
Modified
Oct 25, 2026, 5:10 PM