What is CVE-2026-55604?

CVE-2026-55604 is a high-severity vulnerability in Arikusi Deepseek-mcp-server, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.6/10. Published 2026-07-09.

How severe is CVE-2026-55604?

High severity. CVSS v3 base score is 8.6 out of 10.

Auth bypass in Arikusi Deepseek-mcp-server

CVE-2026-55604

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 o…

Vulnerability class: IDOR (Insecure Direct Object Reference)

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L.

Affected products

Arikusi Deepseek-mcp-server — versions >= 1.4.2, < 1.7.0

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-55604?: CVE-2026-55604 is a high-severity vulnerability in Arikusi Deepseek-mcp-server, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.6/10. Published 2026-07-09.
How severe is CVE-2026-55604?: High severity. CVSS v3 base score is 8.6 out of 10.