{"id":"CVE-2026-7663","aliases":["EUVD-2026-40384","GHSA-5wjx-cxqm-p8r4"],"status":"published","title":"Unauthenticated Cross-User MCP Resource Access and Tool Execution via Streamable Transport Authorization Bypass","description":"IBM Langflow OSS 1.0.0 through 1.9.6 could allow unauthenticated attackers to access protected MCP project resources and execute MCP operations due to improper authorization enforcement in the Streamable MCP transport endpoint.","severity":{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.0052,"percentile":0.44522,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-285","CWE-863"],"published":"2026-06-30T19:16:25Z","modified":"2026-11-04T02:47:51Z","products":[{"vendor":"ibm","product":"langflow oss"},{"vendor":"langflow","product":"langflow"}],"references":[{"url":"https://www.ibm.com/support/pages/node/7277570","tags":["vendor-advisory","patch","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-7663"},{"url":"https://github.com/advisories/GHSA-5wjx-cxqm-p8r4"}],"sources":{"cve":[{"id":"CVE-2026-7663","title":"Unauthenticated Cross-User MCP Resource Access and Tool Execution via Streamable Transport Authorization Bypass","description":"IBM Langflow OSS 1.0.0 through 1.9.6 could allow unauthenticated attackers to access protected MCP project resources and execute MCP operations due to improper authorization enforcement in the Streamable MCP transport endpoint.","status":"published","published":"2026-06-30T19:16:25.323Z","modified":"2026-07-01T03:56:01.122Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"cna"}],"cwes":["CWE-285"],"updated_at":"2026-11-02T14:20:06.216584Z"}],"euvd":[{"id":"EUVD-2026-40384","description":"IBM Langflow OSS 1.0.0 through 1.9.6 could allow unauthenticated attackers to access protected MCP project resources and execute MCP operations due to improper authorization enforcement in the Streamable MCP transport endpoint.","status":"published","published":"2026-06-30T19:16:25Z","modified":"2026-07-01T03:56:01Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-02T18:20:20.762369Z"}],"ghsa":[{"id":"GHSA-5wjx-cxqm-p8r4","title":"IBM Langflow OSS 1.0.0 through 1.9.6 could allow unauthenticated attackers to access protected...","description":"IBM Langflow OSS 1.0.0 through 1.9.6 could allow unauthenticated attackers to access protected MCP project resources and execute MCP operations due to improper authorization enforcement in the Streamable MCP transport endpoint.","status":"published","published":"2026-06-30T21:31:44Z","modified":"2026-07-02T18:36:19Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"cwes":["CWE-285","CWE-863"],"updated_at":"2026-11-02T15:09:12.451783Z"}],"nvd":[{"id":"CVE-2026-7663","description":"IBM Langflow OSS 1.0.0 through 1.9.6 could allow unauthenticated attackers to access protected MCP project resources and execute MCP operations due to improper authorization enforcement in the Streamable MCP transport endpoint.","status":"published","published":"2026-06-30T20:17:31.28Z","modified":"2026-10-25T21:10:00.77Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"secondary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"}],"cwes":["CWE-285","CWE-863"],"updated_at":"2026-11-02T14:12:26.866638Z"}],"osv":[{"id":"CVE-2026-7663","description":"IBM Langflow OSS 1.0.0 through 1.9.6 could allow unauthenticated attackers to access protected MCP project resources and execute MCP operations due to improper authorization enforcement in the Streamable MCP transport endpoint.","status":"published","published":"2026-06-30T20:17:31.28Z","modified":"2026-11-04T02:47:51.607209313Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-04T02:53:00.786919Z"}]}}