---
id: CVE-2026-73603
title: >-
  Flowise before 3.1.4 fails to validate chatflow visibility in the
  unauthenticated text-to-speech endpoint, allowing attackers to abuse private
  chatflow TTS credentials
summary: >-
  Flowise before 3.1.4 fails to validate chatflow visibility in the
  unauthenticated text-to-speech endpoint, allowing attackers to abuse private
  chatflow TTS credentials. Unauthenticated attackers can generate unlimited
  text-to-speech audi…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'
cwe:
  - CWE-862
vendor: flowiseai
product: flowise
affected:
  - flowise < 3.1.4
patched:
  - flowise 3.1.4
published: '2026-08-13'
updated: '2026-09-04'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73603'
references:
  - url: >-
      https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-8gj2-2cvc-6xx7
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/flowise-before-credential-abuse-via-text-to-speech
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-8gj2-2cvc-6xx7
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00329
epssPercentile: 0.23296
ingestedAt: '2026-09-05T16:41:56.807Z'
---

## Overview

Flowise before 3.1.4 fails to validate chatflow visibility in the unauthenticated text-to-speech endpoint, allowing attackers to abuse private chatflow TTS credentials. Unauthenticated attackers can generate unlimited text-to-speech audio using stored OpenAI or ElevenLabs API keys by providing a valid chatflow UUID, incurring costs on the chatflow owner's account.

## Affected

- `flowise < 3.1.4`

## Remediation

Upgrade past the affected range:

- `flowise 3.1.4`