CVE-2026-73603

Medium

Description

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.

SeverityMedium

CVSS5.3

Exploit probability—

ProductFlowise

PublishedAug 13, 2026

First seenAug 13, 2026

Weakness typeCWE-862Missing authorization

How to fix

Update

flowiseai flowise3.1.4 or later
flowise3.1.4 or later

Vendor advisories

github.com/FlowiseAI/Flowise/security/advisories/GHSA-8gj2-2cvc-6xx7

Affected products

Product	Affected versions	Fixed in
flowiseai flowise	v < 3.1.4	3.1.4
flowisenpm	v < 3.1.4	3.1.4

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