Vulnerability 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 Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Flowiseai | Flowise | < 3.1.0 |
Related Weaknesses (CWE)
References
- https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-2qqc-p94c-hxwhMitigationVendor Advisory
- https://www.vulncheck.com/advisories/flowise-session-hijacking-via-weak-default-Third Party Advisory
FAQ
What is CVE-2026-56278?
CVE-2026-56278 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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 ...
How severe is CVE-2026-56278?
CVE-2026-56278 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-56278?
Check the references section above for vendor advisories and patch information. Affected products include: Flowiseai Flowise.