CVE-2026-55604
HIGH@arikusi/deepseek-mcp-server has an Authorization Bypass Through User-Controlled Key
Title source: cnaDescription
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.
References (2)
Core 2
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/arikusi/deepseek-mcp-server/security/advisories/GHSA-fh3r-g96v-f578
X_Refsource_Misc x_refsource_misc
https://github.com/arikusi/deepseek-mcp-server/releases/tag/v1.7.0
Scores
CVSS v3
8.6
EPSS
0.0022
EPSS Percentile
13.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-639
Status
published
Products (1)
arikusi/deepseek-mcp-server
>= 1.4.2, < 1.7.0
Published
Jul 09, 2026
Tracked Since
Jul 10, 2026