CVE-2026-73603

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.

CVSS 4.0

6.3CVSS: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 3.1

5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 25% of CVEs (scores of 2026-10-25)

CWE

CWE-862

Published

2026-08-13

Modified

2026-10-24

Record from

the NVD, synced 2026-10-24

Affected

• flowiseai:flowise

Packages (OSV)

References

• https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-8gj2-2cvc-6xx7
• https://www.vulncheck.com/advisories/flowise-before-credential-abuse-via-text-to-speech
• https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-8gj2-2cvc-6xx7

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