CVE-2026-56278

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 v3 9.1 CRITICAL

9.1^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-2qqc-p94c-hxwh	Mitigation Vendor Advisory
https://www.vulncheck.com/advisories/flowise-session-hijacking-via-weak-default-express-session-secret	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:flowiseai:flowise:*:*:*:*:*:*:*:*

History

06 Jul 2026, 15:27

Type	Values Removed	Values Added
First Time		Flowiseai flowise Flowiseai
CPE		cpe:2.3:a:flowiseai:flowise::::::::
References	~~() https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-2qqc-p94c-hxwh -~~	() https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-2qqc-p94c-hxwh - Mitigation, Vendor Advisory
References	~~() https://www.vulncheck.com/advisories/flowise-session-hijacking-via-weak-default-express-session-secret -~~	() https://www.vulncheck.com/advisories/flowise-session-hijacking-via-weak-default-express-session-secret - Third Party Advisory

30 Jun 2026, 23:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-30 23:17

Updated : 2026-07-06 15:27

NVD link : CVE-2026-56278

Mitre link : CVE-2026-56278

CVE.ORG link : CVE-2026-56278

JSON object : View

Products Affected

flowiseai

flowise

CWE

CWE-798

Use of Hard-coded Credentials

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