PT-2026-56971 · Arikusi · Deepseek-Mcp-Server

Published 2026-07-09 · Updated 2026-07-09 · CVE-2026-55604

Mitre

CVSS v3.1

8.6

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

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.

Fix

IDOR

Weakness Enumeration

CWE-639

Related Identifiers

CVE-2026-55604

Affected Products

Deepseek-Mcp-Server

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-55604 · Security Note
• https://github.com/arikusi/deepseek-mcp-server/releases/tag/v1.7.0 · Note
• https://github.com/arikusi/deepseek-mcp-server/security/advisories/GHSA-fh3r-g96v-f578 · Note