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    2 vulnerabilities by mcp-router

    CVE-2026-81094 (GCVE-0-2026-81094)

    Vulnerability from nvd – Published: 2026-08-27 14:50 – Updated: 2026-08-29 11:48
    VLAI
    Title
    mcp-router CLI before 0.6.3 Binds the MCP Aggregator to All Interfaces Without Requiring Authentication
    Summary
    The mcp-router CLI served its MCP aggregator on every interface and enforced authentication only when the operator asked for it. The serve command in apps/cli/src/commands/serve.ts defaulted its host to the all-interfaces address on a fixed port, and required a token only when the corresponding flag was supplied, so a default invocation exposed the aggregator, and every MCP server it fronted, to anyone able to reach the port. Release 0.6.3 defaults the host to the loopback address and refuses to start without a token whenever the host it is given is not a loopback address; no earlier release carries either check.
    Severity
    9.3 (Critical)
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
    9.1 (Critical)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
    SSVC
    Exploitation: none Automatable: yes Technical Impact: total
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-08-27 18:01 UTC
    CWE
    • CWE-306 - Missing Authentication for Critical Function
    Assigner
    References
    Impacted products
    Vendor Product Version
    mcp-router mcp-router Affected: 0 , < 0.6.3 (semver)
    Unaffected: 4c4642cfd274097ec8b33ecd3047390829c79d35 (git)
    		Create a notification for this product.
    Date Public
    2026-08-26 00:00
    Credits
    Yotam Perkal (Pluto Security)
    Show details on NVD website
    To clipboard 

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    "dateReserved": "2026-08-26T16:00:31.661Z",
    "dateUpdated": "2026-08-29T11:48:09.437Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

    CVE-2026-81094 (GCVE-0-2026-81094)

    Vulnerability from cvelistv5 – Published: 2026-08-27 14:50 – Updated: 2026-08-29 11:48
    VLAI
    Title
    mcp-router CLI before 0.6.3 Binds the MCP Aggregator to All Interfaces Without Requiring Authentication
    Summary
    The mcp-router CLI served its MCP aggregator on every interface and enforced authentication only when the operator asked for it. The serve command in apps/cli/src/commands/serve.ts defaulted its host to the all-interfaces address on a fixed port, and required a token only when the corresponding flag was supplied, so a default invocation exposed the aggregator, and every MCP server it fronted, to anyone able to reach the port. Release 0.6.3 defaults the host to the loopback address and refuses to start without a token whenever the host it is given is not a loopback address; no earlier release carries either check.
    Severity
    9.3 (Critical)
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
    9.1 (Critical)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
    SSVC
    Exploitation: none Automatable: yes Technical Impact: total
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-08-27 18:01 UTC
    CWE
    • CWE-306 - Missing Authentication for Critical Function
    Assigner
    References
    Impacted products
    Vendor Product Version
    mcp-router mcp-router Affected: 0 , < 0.6.3 (semver)
    Unaffected: 4c4642cfd274097ec8b33ecd3047390829c79d35 (git)
    		Create a notification for this product.
    Date Public
    2026-08-26 00:00
    Credits
    Yotam Perkal (Pluto Security)
    Show details on NVD website
    To clipboard 

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