Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
Flowise Flowise
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 9.1 · Critical EPSS 0.37% · P30

Affected Version Matrix 2

VendorProduct Version RangeStatus
Flowise Flowise < 3.1.0 affected
3.1.0 unaffected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-56278

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

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

Vendor Product Affected Versions CPE Subscribe
Flowise Flowise 0 ~ 3.1.0 -

II. Public POCs for CVE-2026-56278

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9573 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-56278

请登录查看更多情报信息。

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

No comments yet

Leave a comment