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CVE-2026-56278

Flowise - Session Hijacking via Weak Default Express Session Secret

Published: Jun 30, 2026Updated: Jul 6, 2026 Sources: CVE List NVDCWE-798
9.1CRITICAL
NVD MITRE
EPSS Score
0.4%
Top 70.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-798

Affected Products

flowiseai
oss-projectaka flowise, flowise-components, embed
flowiseOn-premWeb App
AI / ML / ai-agent-tooling
Flowise
oss-projectaka flowise-ai
FlowiseSaaS
AI / ML / ai-agent-tooling

Exploitability

Workaround Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Credential Access
Initial Access
View detailed technique mapping

References

https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-2qqc-p94c-hxwh
github.com
https://www.vulncheck.com/advisories/flowise-session-hijacking-via-weak-default-express-session-secret
vulncheck.com

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