{"id":"CVE-2026-73603","title":"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","summary":"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 audi…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","cwe":["CWE-862"],"vendor":"flowiseai","product":"flowise","affected":["flowise < 3.1.4"],"patched":["flowise 3.1.4"],"published":"2026-08-13","updated":"2026-09-04","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73603","references":[{"url":"https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-8gj2-2cvc-6xx7","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/flowise-before-credential-abuse-via-text-to-speech","label":"disclosure@vulncheck.com"},{"url":"https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-8gj2-2cvc-6xx7","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd"],"epss":0.00338,"epssPercentile":0.2731,"ingestedAt":"2026-09-05T16:41:56.807Z","slug":"CVE-2026-73603","body":"## Overview\n\nFlowise 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.\n\n## Affected\n\n- `flowise < 3.1.4`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `flowise 3.1.4`","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}