{"id":"CVE-2026-56275","aliases":["GHSA-9hrv-gvrv-6gf2"],"url":"https://o3.security/vulnerability/CVE-2026-56275","summary":"Flowise - Server-Side Request Forgery via Execute Flow Base URL","details":"### Summary\n\nThe attacker provides an intranet address through the base url field configured in the Execute Flow node \n→ Bypass checkDenyList / resolveAndValidate in httpSecurity.ts (not called)\n→ Causes the server to initiate an HTTP request to any internal network address, read cloud metadata, or detect internal network services \n\n### Details\n\n<img width=\"1280\" height=\"860\" alt=\"9a52a74e6fe2fd78e4962d1d68057fc2\" src=\"https://github.com/user-attachments/assets/20df0006-9129-4886-8928-16d19a617c23\" />\n\nThen initiate the call: \n\n```\nPOST /api/v1/prediction/d6739838-d3b3-43d9-86ff-911a3d757a7e HTTP/1.1\nHost: 127.0.0.1:3000\nContent-Type: application/json\nAuthorization: Bearer apikey\nContent-Length: 17\n\n{\"question\": \"1\"}\n```\n\nServer received a request:\n\n<img width=\"1432\" height=\"172\" alt=\"f45c757fec408e13739db068252ff21b\" src=\"https://github.com/user-attachments/assets/d3dfe0f5-83ec-4c79-ab32-754382a68d5f\" />\n\nAnd there is an echo: \n\n<img width=\"1280\" height=\"666\" alt=\"fa0caf0deb306cfeeea8fdf8941a287e\" src=\"https://github.com/user-attachments/assets/55a94d25-120b-4e9c-9517-46c2fc2b667f\" />\n\nFix:\nCall secureFetch for verification\n\n\n\n### Impact\n\nThis is a Server-Side Request Forgery (SSRF) vulnerability that may lead to the following risks: \n- Explore Internal Web Applications\n- Access sensitive management interfaces\n- Leak internal configuration, credentials, or confidential information\n\nThis vulnerability significantly increases the risk of internal service enumeration and potential lateral movement in enterprise environments.","published":"2026-06-23T12:13:01.376Z","modified":"2026-08-12T03:51:08.373446038Z","cvss":null,"epss":{"score":0.00214,"percentile":0.11863,"asOf":"2026-08-10"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"flowise","fixedVersion":"3.1.0"},{"ecosystem":"npm","name":"flowise-components","fixedVersion":"3.1.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56275.json"},{"type":"ADVISORY","url":"https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-9hrv-gvrv-6gf2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56275"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/flowise-server-side-request-forgery-via-execute-flow-base-url"},{"type":"PACKAGE","url":"https://github.com/FlowiseAI/Flowise"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:08.373446038Z"}}