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CVE-2026-56276— Flowise - Mass Assignment in PUT /api/v1/user Allows Password Hash Override

Quick assessment

Affected
Flowise Flowise
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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 3.1.2之前版本存在输入验证错误漏洞，该漏洞源于PUT /api/v1/user端点存在批量赋值问题，允许经过身份验证的用户在未经验证的情况下直接修改凭据字段，攻击者可通过提供特制的密码哈希绕过密码更改验证和会话失效，从而实现临时会话泄露后的持久账户访问。

AI Predicted 8.1 Difficulty: Moderate EPSS 0.37% · P28

Affected Version Matrix 2

VendorProduct Version RangeStatus
Flowise Flowise < 3.1.2 affected
3.1.2 unaffected
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I. Basic Information for CVE-2026-56276

Vulnerability Information
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Vulnerability Title
Flowise - Mass Assignment in PUT /api/v1/user Allows Password Hash Override
Source: CVE Program / CVE List V5
Vulnerability Description
Flowise before 3.1.2 contains a mass assignment vulnerability in the PUT /api/v1/user endpoint that allows authenticated users to directly modify the credential field without validation. Attackers can bypass password change verification and session invalidation by supplying a crafted password hash, establishing persistent account access after temporary session compromise.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-915
Source: CVE Program / CVE List V5
Vulnerability Title
FlowiseAI Flowise 输入验证错误漏洞
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 3.1.2之前版本存在输入验证错误漏洞，该漏洞源于PUT /api/v1/user端点存在批量赋值问题，允许经过身份验证的用户在未经验证的情况下直接修改凭据字段，攻击者可通过提供特制的密码哈希绕过密码更改验证和会话失效，从而实现临时会话泄露后的持久账户访问。
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 ~ 3.1.2 -

II. Public POCs for CVE-2026-56276

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III. Intelligence Information for CVE-2026-56276

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Vendor Advisories for CVE-2026-56276 (2)

Same Patch Batch · Flowise · 2026-06-20 · 4 CVEs total

CVE-2024-58351 9.8 CRITICAL Flowise - Remote Code Execution via overrideConfig Parameter
CVE-2025-71331 6.1 MEDIUM Flowise - Cross-Site Scripting in Chat Messages and Agent Workflows
CVE-2026-56267 Flowise - PII Disclosure via Unauthenticated Forgot Password Endpoint

IV. Related Vulnerabilities

Same product: Flowise
Same vendor: Flowise
Same weakness: CWE-915

V. Comments for CVE-2026-56276

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