Critical severity9.1NVD Advisory· Published Jun 30, 2026· Updated Jul 6, 2026
CVE-2026-56278
CVE-2026-56278
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
2Patches
Vulnerability mechanics
References
2- github.com/FlowiseAI/Flowise/security/advisories/GHSA-2qqc-p94c-hxwhnvdMitigationVendor Advisory
- www.vulncheck.com/advisories/flowise-session-hijacking-via-weak-default-express-session-secretnvdThird Party Advisory
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