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CVE-2026-56278— Flowise - Session Hijacking via Weak Default Express Session Secret

CVSS 9.1 · Critical EPSS 0.37% · P30

Affected Version Matrix 2

VendorProductVersion RangeStatus
FlowiseFlowise< 3.1.0affected
3.1.0unaffected
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I. Basic Information for CVE-2026-56278

Vulnerability Information
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Vulnerability Title
Flowise - Session Hijacking via Weak Default Express Session Secret
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用硬编码的凭证
Source: CVE Program / CVE List V5
Vulnerability Title
FlowiseAI Flowise 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FlowiseAI Flowise是FlowiseAI公司开源的一个用于轻松构建 LLM 应用程序的工具。 FlowiseAI Flowise 3.1.0之前版本存在信任管理问题漏洞，该漏洞源于对express-session中间件使用了弱硬编码默认密钥，可能导致攻击者伪造有效签名会话Cookie，冒充任意用户绕过身份验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
FlowiseFlowise 0 ~ 3.1.0 -

II. Public POCs for CVE-2026-56278

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 9573 chars
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III. Intelligence Information for CVE-2026-56278

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Vendor Advisories for CVE-2026-56278 (1)

Other References for CVE-2026-56278 (1)

IV. Related Vulnerabilities

Same product: Flowise
Same vendor: Flowise
Same weakness: CWE-798

V. Comments for CVE-2026-56278

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