CVE-2026-73603Public exploitNetwork attack vector

API credential abuse via missing TTS authorization

Published Aug 13, 2026 · Updated Aug 13, 2026

Missing authorization in Flowise before 3.1.4 allows remote attackers to consume private chatflow TTS credentials through a public endpoint. The whitelisted generateTextToSpeech controller fetches a chatflow without workspace scoping or an isPublic check, then decrypts its stored OpenAI or ElevenLabs key for the request. Exploitation requires a valid UUID for a private chatflow with TTS enabled and permits unlimited audio generation that consumes the owner's API quota and funds.

CVSS severity6.3
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Flowise before 3.1.4 allows remote attackers to consume private chatflow TTS credentials through a public endpoint. The whitelisted generateTextToSpeech controller fetches a chatflow without workspace scoping or an isPublic check, then decrypts its stored OpenAI or ElevenLabs key for the request. Exploitation requires a valid UUID for a private chatflow with TTS enabled and permits unlimited audio generation that consumes the owner's API quota and funds.

The record

CVE
CVE-2026-73603
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
FlowiseAI
Product
Flowise
Classifications
CWE-862, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.1.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FlowiseAI · Flowiseversion=0 <3.1.4

Published CVSS scores

6.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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