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    8 vulnerabilities found for mcp_python_sdk by lfprojects

    CVE-2026-59950 (GCVE-0-2026-59950)

    Vulnerability from nvd – Published: 2026-07-15 20:08 – Updated: 2026-07-17 12:28
    VLAI
    Title
    MCP Python SDK: WebSocket server transport does not support Host/Origin validation
    Summary
    The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to 1.28.1, the deprecated mcp.server.websocket.websocket_server transport accepted WebSocket handshakes without applying Host or Origin header validation, leaving no SDK-level way to restrict which origins could connect to applications that exposed that transport. This issue is fixed in version 1.28.1.
    Severity
    7.6 (High)
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: total
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-346 - Origin Validation Error
    • CWE-1385 - Missing Origin Validation in WebSockets
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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    CVE-2026-52870 (GCVE-0-2026-52870)

    Vulnerability from nvd – Published: 2026-07-15 20:07 – Updated: 2026-07-16 13:01
    VLAI
    Title
    MCP Python SDK: Experimental task handlers allow any client to access and cancel other clients' tasks
    Summary
    The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP). From 1.23.0 until 1.27.2, default handlers installed by server.experimental.enable_tasks() for tasks/list, tasks/get, tasks/result, and tasks/cancel operate only on task identifiers without recording the session that created each task, allowing any connected client to enumerate, read results from, consume messages for, or cancel other clients' tasks. This issue is fixed in version 1.27.2.
    Severity
    7.6 (High)
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    modelcontextprotocol python-sdk Affected: >= 1.23.0, < 1.27.2
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-52869 (GCVE-0-2026-52869)

    Vulnerability from nvd – Published: 2026-07-15 20:06 – Updated: 2026-07-16 13:00
    VLAI
    Title
    MCP Python SDK: HTTP transports serve session requests without verifying the authenticated principal
    Summary
    The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to 1.27.2, the SSE and stateful Streamable HTTP transports mcp.server.sse.SseServerTransport and mcp.server.streamable_http_manager.StreamableHTTPSessionManager route requests to existing sessions using only the session_id query parameter or Mcp-Session-Id header without verifying the authenticated principal that created the session, allowing a different bearer-token-authenticated client with a known session ID to inject JSON-RPC messages into that session. This issue is fixed in version 1.27.2.
    Severity
    7.1 (High)
    CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L
    SSVC
    Exploitation: none Automatable: no Technical Impact: total
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-639 - Authorization Bypass Through User-Controlled Key
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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    CVE-2025-66416 (GCVE-0-2025-66416)

    Vulnerability from nvd – Published: 2025-12-02 18:14 – Updated: 2025-12-02 18:45
    VLAI
    Title
    DNS Rebinding Protection Disabled by Default in Model Context Protocol Python SDK for Servers Running on Localhost
    Summary
    The MCP Python SDK, called `mcp` on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to version 1.23.0, tThe Model Context Protocol (MCP) Python SDK does not enable DNS rebinding protection by default for HTTP-based servers. When an HTTP-based MCP server is run on localhost without authentication using FastMCP with streamable HTTP or SSE transport, and has not configured TransportSecuritySettings, a malicious website could exploit DNS rebinding to bypass same-origin policy restrictions and send requests to the local MCP server. This could allow an attacker to invoke tools or access resources exposed by the MCP server on behalf of the user in those limited circumstances. Note that running HTTP-based MCP servers locally without authentication is not recommended per MCP security best practices. This issue does not affect servers using stdio transport. This vulnerability is fixed in 1.23.0.
    Severity
    7.6 (High)
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: total
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-1188 - Insecure Default Initialization of Resource
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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    CVE-2026-59950 (GCVE-0-2026-59950)

    Vulnerability from cvelistv5 – Published: 2026-07-15 20:08 – Updated: 2026-07-17 12:28
    VLAI
    Title
    MCP Python SDK: WebSocket server transport does not support Host/Origin validation
    Summary
    The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to 1.28.1, the deprecated mcp.server.websocket.websocket_server transport accepted WebSocket handshakes without applying Host or Origin header validation, leaving no SDK-level way to restrict which origins could connect to applications that exposed that transport. This issue is fixed in version 1.28.1.
    Severity
    7.6 (High)
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: total
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-346 - Origin Validation Error
    • CWE-1385 - Missing Origin Validation in WebSockets
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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    CVE-2026-52870 (GCVE-0-2026-52870)

    Vulnerability from cvelistv5 – Published: 2026-07-15 20:07 – Updated: 2026-07-16 13:01
    VLAI
    Title
    MCP Python SDK: Experimental task handlers allow any client to access and cancel other clients' tasks
    Summary
    The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP). From 1.23.0 until 1.27.2, default handlers installed by server.experimental.enable_tasks() for tasks/list, tasks/get, tasks/result, and tasks/cancel operate only on task identifiers without recording the session that created each task, allowing any connected client to enumerate, read results from, consume messages for, or cancel other clients' tasks. This issue is fixed in version 1.27.2.
    Severity
    7.6 (High)
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    modelcontextprotocol python-sdk Affected: >= 1.23.0, < 1.27.2
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-52869 (GCVE-0-2026-52869)

    Vulnerability from cvelistv5 – Published: 2026-07-15 20:06 – Updated: 2026-07-16 13:00
    VLAI
    Title
    MCP Python SDK: HTTP transports serve session requests without verifying the authenticated principal
    Summary
    The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to 1.27.2, the SSE and stateful Streamable HTTP transports mcp.server.sse.SseServerTransport and mcp.server.streamable_http_manager.StreamableHTTPSessionManager route requests to existing sessions using only the session_id query parameter or Mcp-Session-Id header without verifying the authenticated principal that created the session, allowing a different bearer-token-authenticated client with a known session ID to inject JSON-RPC messages into that session. This issue is fixed in version 1.27.2.
    Severity
    7.1 (High)
    CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L
    SSVC
    Exploitation: none Automatable: no Technical Impact: total
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-639 - Authorization Bypass Through User-Controlled Key
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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    CVE-2025-66416 (GCVE-0-2025-66416)

    Vulnerability from cvelistv5 – Published: 2025-12-02 18:14 – Updated: 2025-12-02 18:45
    VLAI
    Title
    DNS Rebinding Protection Disabled by Default in Model Context Protocol Python SDK for Servers Running on Localhost
    Summary
    The MCP Python SDK, called `mcp` on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to version 1.23.0, tThe Model Context Protocol (MCP) Python SDK does not enable DNS rebinding protection by default for HTTP-based servers. When an HTTP-based MCP server is run on localhost without authentication using FastMCP with streamable HTTP or SSE transport, and has not configured TransportSecuritySettings, a malicious website could exploit DNS rebinding to bypass same-origin policy restrictions and send requests to the local MCP server. This could allow an attacker to invoke tools or access resources exposed by the MCP server on behalf of the user in those limited circumstances. Note that running HTTP-based MCP servers locally without authentication is not recommended per MCP security best practices. This issue does not affect servers using stdio transport. This vulnerability is fixed in 1.23.0.
    Severity
    7.6 (High)
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: total
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-1188 - Insecure Default Initialization of Resource
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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      "providerMetadata": {
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        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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          "tags": [
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        {
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      "source": {
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      "title": "DNS Rebinding Protection Disabled by Default in Model Context Protocol Python SDK for Servers Running on Localhost"
    }
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    "dateReserved": "2025-11-28T23:33:56.366Z",
    "dateUpdated": "2025-12-02T18:45:53.656Z",
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