# CVE-2026-90535

## Summary

- **CVE ID:** CVE-2026-90535
- **Severity:** MEDIUM
- **CVSS Score:** 6.3 (CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N)
- **CWE:** CWE-862
- **Published:** Sep 12, 2026
- **Last Modified:** Sep 14, 2026

## 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.

## Affected Products

- FlowiseAI — Flowise (0)
- FlowiseAI — Flowise (3.1.4)

## References

- [CNA](https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-xhxx-56g3-mx2r)
- [CNA](https://www.vulncheck.com/advisories/flowise-before-3.1.4-denial-of-service-via-text-to-speech-abort)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.27%
- **EPSS Percentile:** 19.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._