---
id: CVE-2026-90535
title: >-
  Flowise versions before 3.1.4 contain an unauthenticated denial of service
  vulnerability in the /api/v1/text-to-speech/abort endpoint that accepts
  user-supplied chatflowId and chatId without ownership verification
summary: >-
  Flowise versions before 3.1.4 contain an unauthenticated denial of service
  vulnerability in the /api/v1/text-to-speech/abort endpoint that accepts
  user-supplied chatflowId and chatId without ownership verification. Attackers
  can terminat…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-862
vendor: flowiseai
product: flowise
affected:
  - flowise < 3.1.4
patched:
  - flowise 3.1.4
published: '2026-09-12'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T19:07:20.020'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90535'
references:
  - url: >-
      https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-xhxx-56g3-mx2r
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/flowise-before-3.1.4-denial-of-service-via-text-to-speech-abort
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-xhxx-56g3-mx2r
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00272
epssPercentile: 0.1984
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-14T16:04:10.638559Z'
scores:
  nvd: 7.5
  cna: 6.3
ingestedAt: '2026-09-14T15:23:07.480Z'
---

## Overview

Flowise versions before 3.1.4 contain an unauthenticated denial of service vulnerability in the /api/v1/text-to-speech/abort endpoint that accepts user-supplied chatflowId and chatId without ownership verification. Attackers can terminate active chatflow predictions for any user by submitting requests with known chatflow and chat identifiers, causing targeted service disruption.

## Affected

- `flowise < 3.1.4`

## Remediation

Upgrade past the affected range:

- `flowise 3.1.4`