High 8.6Published Jul 9, 2026

CVE-2026-55604@arikusi/deepseek-mcp-server has an Authorization Bypass Through User-Controlled Key

Updated under an hour ago (Oct 26, 2026, 2:30 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for arikusi deepseek-mcp-server

Exploited in the last 30 days

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.

CVSS: 8.6 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Weakness (CWE): CWE-639
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Jul 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

arikusi deepseek-mcp-server arikusi:deepseek_mcp_server (from the name)	from 1.4.2, < 1.7.0	CNA record

References

References

https://github.com/arikusi/deepseek-mcp-server/security/advisories/GHSA-fh3r-g96v-f578	x-refsource-confirm
https://github.com/arikusi/deepseek-mcp-server/releases/tag/v1.7.0	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.