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4 vulnerabilities found for deepseek-mcp-server by arikusi
CVE-2026-55605 (GCVE-0-2026-55605)
Vulnerability from nvd – Published: 2026-07-09 21:10 – Updated: 2026-07-10 13:35
VLAI
EPSS
VEX
Title
@arikusi/deepseek-mcp-server Missing Authentication on Self-Hosted HTTP MCP Endpoint
Summary
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: `createMcpExpressApp` is called without an `authProvider` and no middleware guards the route, so any network-reachable client can issue an unauthenticated `initialize` request and obtain a valid MCP session identifier. In reproduced testing against commit `5e1302171e99`, an unauthenticated client was able to initialize a session, enumerate tools, and invoke the local `deepseek_sessions` tool with no credentials. The same unauthenticated session also exposes `deepseek_chat`, whose handler uses the server-side `DEEPSEEK_API_KEY` when self-hosted deployments configure one. This issue applies to self-hosted HTTP mode, not the separately documented hosted BYOK endpoint in `README.md`, which expects an `Authorization: Bearer ...` header. Upstream self-hosted container assets enable HTTP mode by default (`Dockerfile`) and publish port `3000` (`docker-compose.yml`). Version 1.8.0 contains a patch for this issue.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-306 - Missing Authentication for Critical Function
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/arikusi/deepseek-mcp-server/se… | x_refsource_CONFIRM |
| https://github.com/arikusi/deepseek-mcp-server/bl… | x_refsource_MISC |
| https://github.com/arikusi/deepseek-mcp-server/re… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| arikusi | deepseek-mcp-server |
Affected:
>= 1.4.2, < 1.8.0
|
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CVE-2026-55604 (GCVE-0-2026-55604)
Vulnerability from nvd – Published: 2026-07-09 21:13 – Updated: 2026-07-10 14:42
VLAI
EPSS
VEX
Title
@arikusi/deepseek-mcp-server has an Authorization Bypass Through User-Controlled Key
Summary
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.
Severity
8.6 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/arikusi/deepseek-mcp-server/se… | x_refsource_CONFIRM |
| https://github.com/arikusi/deepseek-mcp-server/re… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| arikusi | deepseek-mcp-server |
Affected:
>= 1.4.2, < 1.7.0
|
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CVE-2026-55604 (GCVE-0-2026-55604)
Vulnerability from cvelistv5 – Published: 2026-07-09 21:13 – Updated: 2026-07-10 14:42
VLAI
EPSS
VEX
Title
@arikusi/deepseek-mcp-server has an Authorization Bypass Through User-Controlled Key
Summary
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.
Severity
8.6 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/arikusi/deepseek-mcp-server/se… | x_refsource_CONFIRM |
| https://github.com/arikusi/deepseek-mcp-server/re… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| arikusi | deepseek-mcp-server |
Affected:
>= 1.4.2, < 1.7.0
|
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CVE-2026-55605 (GCVE-0-2026-55605)
Vulnerability from cvelistv5 – Published: 2026-07-09 21:10 – Updated: 2026-07-10 13:35
VLAI
EPSS
VEX
Title
@arikusi/deepseek-mcp-server Missing Authentication on Self-Hosted HTTP MCP Endpoint
Summary
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: `createMcpExpressApp` is called without an `authProvider` and no middleware guards the route, so any network-reachable client can issue an unauthenticated `initialize` request and obtain a valid MCP session identifier. In reproduced testing against commit `5e1302171e99`, an unauthenticated client was able to initialize a session, enumerate tools, and invoke the local `deepseek_sessions` tool with no credentials. The same unauthenticated session also exposes `deepseek_chat`, whose handler uses the server-side `DEEPSEEK_API_KEY` when self-hosted deployments configure one. This issue applies to self-hosted HTTP mode, not the separately documented hosted BYOK endpoint in `README.md`, which expects an `Authorization: Bearer ...` header. Upstream self-hosted container assets enable HTTP mode by default (`Dockerfile`) and publish port `3000` (`docker-compose.yml`). Version 1.8.0 contains a patch for this issue.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-306 - Missing Authentication for Critical Function
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/arikusi/deepseek-mcp-server/se… | x_refsource_CONFIRM |
| https://github.com/arikusi/deepseek-mcp-server/bl… | x_refsource_MISC |
| https://github.com/arikusi/deepseek-mcp-server/re… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| arikusi | deepseek-mcp-server |
Affected:
>= 1.4.2, < 1.8.0
|
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},
{
"name": "https://github.com/arikusi/deepseek-mcp-server/releases/tag/v1.8.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/arikusi/deepseek-mcp-server/releases/tag/v1.8.0"
}
],
"source": {
"advisory": "GHSA-72f3-6w86-7rv3",
"discovery": "UNKNOWN"
},
"title": "@arikusi/deepseek-mcp-server Missing Authentication on Self-Hosted HTTP MCP Endpoint"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-55605",
"datePublished": "2026-07-09T21:10:53.882Z",
"dateReserved": "2026-06-16T23:31:22.445Z",
"dateUpdated": "2026-07-10T13:35:30.010Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}