| Component | Flowise |
| Severity | critical (CVSS 9.1) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| Published (NVD) | 2026-06-30 |
| Last modified | 2026-07-06 |
| Affected versions | flowise < 3.1.0 |
| Fixed in | 3.1.0 |
| Weakness | CWE-798 |
| CISA KEV | not listed |
NVD 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.
What to do
- Upgrade Flowise to
3.1.0or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-56278
- 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
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