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Flowise EUVDEUVD-2026-57807

| CVE-2026-73603 MEDIUM
Missing Authorization (CWE-862)
2026-08-13 VulnCheck GHSA-w2r6-2jm7-ph5m
Authentication Bypass Flowise
6.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
6.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
6.5 MEDIUM

Network-accessible, no auth required; UUID prerequisite is low complexity; integrity and availability both low as victim's credentials are abused incurring cost.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Aug 13, 2026 - 13:01 EUVD
Source Code Evidence Fetched
Aug 13, 2026 - 12:57 vuln.today
Analysis Generated
Aug 13, 2026 - 12:57 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Flowise before 3.1.4 exposes stored third-party API credentials (OpenAI, ElevenLabs) through a missing authorization check in the unauthenticated text-to-speech endpoint, enabling financial abuse at the chatflow owner's expense. The /api/v1/text-to-speech/generate endpoint is whitelisted from authentication and fetches any chatflow by UUID without verifying its isPublic status, allowing any network-reachable attacker with a valid chatflow UUID to generate unlimited TTS audio billed to the victim. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain valid chatflow UUID via shared link or enumeration
Delivery
Send unauthenticated POST to /api/v1/text-to-speech/generate
Exploit
Bypass missing visibility check on private chatflow
Execution
Extract stored OpenAI/ElevenLabs credentialId from chatflow config
Persist
Decrypt and use victim's API key for TTS generation
Impact
Incur unlimited API costs on victim account
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Vulnerability AssessmentAI

Exploitation The target Flowise instance must be running a version prior to 3.1.4 and must be network-accessible to the attacker. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 6.3 (Medium) reflects network accessibility with no required privileges or user interaction, but the AT:P (Attack Requirements: Present) metric acknowledges that exploitation depends on the attacker possessing a valid chatflow UUID - a meaningful but not prohibitive prerequisite. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker obtains a valid Flowise chatflow UUID - for example, from a publicly shared chatflow link or by enumerating common UUID formats - and sends a crafted unauthenticated POST request to `/api/v1/text-to-speech/generate` with that UUID and arbitrary text input. Flowise retrieves the private chatflow, extracts the stored OpenAI or ElevenLabs credential, and fulfills the TTS request, billing the API usage to the chatflow owner. …
Remediation Upgrade Flowise to version 3.1.4, which introduces a chatflow visibility check in the TTS controller. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-57807 vulnerability details – vuln.today
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