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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Flowise | Flowise | < 3.1.0 | 3.1.0 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | flowise | < 3.1.0 | 3.1.0 | GHSA-2qqc-p94c-hxwh |
Advisories 1
- WID-SEC-2026-1145 Flowise: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 12, 2026
References
- GitHub Security Advisory (GHSA-2qqc-p94c-hxwh) vendor-advisory
- VulnCheck Advisory: Flowise - Session Hijacking via Weak Default Express Session Secret third-party-advisory