---
id: CVE-2026-56276
title: Flowise - Mass Assignment in PUT /api/v1/user Allows Password Hash Override
summary: >-
  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 …
severity: medium
cvss: 6
cvssVector: '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'
cvssSource: cna
cwe:
  - CWE-915
vendor: Flowise
product: Flowise
affected:
  - Flowise < 3.1.2
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-06-22T13:49:32.938401Z'
exploitAvailable: true
published: '2026-06-20'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T14:05:53.186Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-56276'
references:
  - url: >-
      https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-59fh-9f3p-7m39
    label: GitHub Security Advisory (GHSA-59fh-9f3p-7m39)
  - url: >-
      https://www.vulncheck.com/advisories/flowise-mass-assignment-in-put-api-v1-user-allows-password-hash-override
    label: >-
      VulnCheck Advisory: Flowise - Mass Assignment in PUT /api/v1/user Allows
      Password Hash Override
tags:
  - cve.org
  - exploit-available
epss: 0.00366
epssPercentile: 0.30666
ingestedAt: '2026-11-08T14:51:22.360Z'
---

## Overview

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.

## Affected

- `Flowise < 3.1.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.