{"id":"CVE-2026-56278","aliases":["GHSA-2qqc-p94c-hxwh"],"url":"https://o3.security/vulnerability/CVE-2026-56278","summary":"Flowise - Session Hijacking via Weak Default Express Session Secret","details":"Flowise before 3.1.0 (affected versions 3.0.13 and earlier) uses a weak hardcoded default secret ('flowise') for the express-session middleware when the EXPRESS_SESSION_SECRET environment variable is not set (packages/server/src/enterprise/middleware/passport/index.ts). Because this default secret is publicly visible in the source code, an attacker can forge valid signed session cookies to impersonate any user and bypass authentication.","published":"2026-06-30T22:08:27.947Z","modified":"2026-08-07T11:51:01.669619775Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"flowise","fixedVersion":"3.1.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56278.json"},{"type":"ADVISORY","url":"https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-2qqc-p94c-hxwh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56278"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/flowise-session-hijacking-via-weak-default-express-session-secret"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:51:01.669619775Z"}}