| Component | Flowise |
| Severity | high (CVSS 7.5) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Published (NVD) | 2026-09-12 |
| Last modified | 2026-09-15 |
| Affected versions | flowise < 3.1.4 |
| Fixed in | 3.1.4 |
| Weakness | CWE-862 |
| CISA KEV | not listed |
NVD description
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 terminate active chatflow predictions for any user by submitting requests with known chatflow and chat identifiers, causing targeted service disruption.
What to do
- Upgrade Flowise to
3.1.4or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-90535
- https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-xhxx-56g3-mx2r
- https://www.vulncheck.com/advisories/flowise-before-3.1.4-denial-of-service-via-text-to-speech-abort
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