{"id":"CVE-2026-90535","title":"Flowise versions before 3.1.4 contain an unauthenticated denial of service vulnerability in the /api/v1/text-to-speech/abort endpoint that accepts user-supplied chatflowId and chatId without ownership verification","summary":"Flowise versions before 3.1.4 contain an unauthenticated denial of service vulnerability in the /api/v1/text-to-speech/abort endpoint that accepts user-supplied chatflowId and chatId without ownership verification. Attackers can terminat…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-862"],"vendor":"flowiseai","product":"flowise","affected":["flowise < 3.1.4"],"patched":["flowise 3.1.4"],"published":"2026-09-12","updated":"2026-09-15","sourceUpdated":"2026-09-15T19:07:20.020","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90535","references":[{"url":"https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-xhxx-56g3-mx2r","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/flowise-before-3.1.4-denial-of-service-via-text-to-speech-abort","label":"disclosure@vulncheck.com"},{"url":"https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-xhxx-56g3-mx2r","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00272,"epssPercentile":0.1984,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-14T16:04:10.638559Z"},"scores":{"nvd":7.5,"cna":6.3},"ingestedAt":"2026-09-14T15:23:07.480Z","slug":"CVE-2026-90535","body":"## Overview\n\nFlowise versions before 3.1.4 contain an unauthenticated denial of service vulnerability in the /api/v1/text-to-speech/abort endpoint that accepts user-supplied chatflowId and chatId without ownership verification. Attackers can terminate active chatflow predictions for any user by submitting requests with known chatflow and chat identifiers, causing targeted service disruption.\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":"midnight","depthScore":53,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":204467,"id":"CVE-2026-90535","ts":1789501413527,"field":"cvss","old":"6.3","new":"7.5"},{"seq":204466,"id":"CVE-2026-90535","ts":1789501413527,"field":"severity","old":"medium","new":"high"},{"seq":203068,"id":"CVE-2026-90535","ts":1789409572121,"field":"exploit_available","old":"false","new":"true"}]}