p PatchFirst

CVE-2026-56278

CVE-2026-56278 · Flowise - Session Hijacking via Weak Default Express Session Secret

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 9.3 · Critical · EPSS 0.5% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • flowise

    Versions
    • ≥ 0, < 3.1.0: Affected (semver)
    • 3.1.0: Not affected (semver)

    Update to 3.1.0

  • flowise npm

    Affected ranges
    • SEMVER: < 3.1.0

    Update to 3.1.0

Original sources

Check your server →