What is CVE-2026-55605?

CVE-2026-55605 is a medium-severity vulnerability in Arikusi Deepseek-mcp-server, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2026-07-09.

How severe is CVE-2026-55605?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Auth bypass in Arikusi Deepseek-mcp-server

CVE-2026-55605

DeepSeek MCP Server is an MCP server for DeepSeek V4. Starting in version 1.4.2 and prior to version 1.8.0, the self-hosted HTTP transport of `@arikusi/deepseek-mcp-server` exposes `POST /mcp` without any authentication: `createMcpExpressA…

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Arikusi Deepseek-mcp-server — versions >= 1.4.2, < 1.8.0

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

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

Frequently asked questions

What is CVE-2026-55605?: CVE-2026-55605 is a medium-severity vulnerability in Arikusi Deepseek-mcp-server, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2026-07-09.
How severe is CVE-2026-55605?: Medium severity. CVSS v3 base score is 5.3 out of 10.