---
id: CVE-2025-71331
title: Flowise - Cross-Site Scripting in Chat Messages and Agent Workflows
summary: >-
  Flowise before 3.0.8 contains a cross-site scripting (XSS) vulnerability
  caused by insufficient input filtering in chat messages and custom agent
  functions. An attacker can inject malicious JavaScript by sending an iframe
  payload (e.g., …
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-80
vendor: Flowise
product: Flowise
affected:
  - Flowise < 3.0.8
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-06-22T13:50:59.326536Z'
exploitAvailable: true
published: '2026-06-20'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T14:00:28.219Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-71331'
references:
  - url: >-
      https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-4fr9-3x69-36wv
    label: GitHub Security Advisory (GHSA-4fr9-3x69-36wv)
  - url: >-
      https://www.vulncheck.com/advisories/flowise-cross-site-scripting-in-chat-messages-and-agent-workflows
    label: >-
      VulnCheck Advisory: Flowise - Cross-Site Scripting in Chat Messages and
      Agent Workflows
tags:
  - cve.org
  - exploit-available
epss: 0.00325
epssPercentile: 0.25737
ingestedAt: '2026-11-08T14:51:22.484Z'
---

## Overview

Flowise before 3.0.8 contains a cross-site scripting (XSS) vulnerability caused by insufficient input filtering in chat messages and custom agent functions. An attacker can inject malicious JavaScript by sending an iframe payload (e.g., <iframe src="javascript:alert(document.cookie)">) in a chat box, or by having a custom agent function return an XSS payload from an external website. The injected script executes in the victim's browser, enabling theft of cookies and session data.

## Affected

- `Flowise < 3.0.8`

## Remediation

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