{"cve":"CVE-2026-56278","nvd":{"published":"2026-06-30T23:17:29.610","modified":"2026-07-06T15:27:21.990","status":"Analyzed","description":"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.","cvss_v4":{"vector":"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","score":9.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1},"cwes":["CWE-798"],"references":["https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-2qqc-p94c-hxwh","https://www.vulncheck.com/advisories/flowise-session-hijacking-via-weak-default-express-session-secret"],"products":["flowiseai:flowise"],"source":"nvd","synced_at":"2026-10-19T22:42:16.820116992+00:00"},"epss":{"cve":"CVE-2026-56278","score":0.00528,"percentile":0.44692,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-2qqc-p94c-hxwh","url":"https://osv.dev/vulnerability/GHSA-2qqc-p94c-hxwh","summary":"Flowise: Weak Default Express Session Secret","modified":"2026-07-08T08:27:16.632189174Z","packages":[{"ecosystem":"npm","name":"flowise","purl":"pkg:npm/flowise","ranges":["<3.1.0"],"fixed":["3.1.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}