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CVE-2026-90535

7.5 · HIGH

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 owners…

Published Sep 12, 2026flowiseaiCWE-862EPSS 0.48%

Overview

CVE-2026-90535 is a high-severity vulnerability affecting flowiseai flowise. It was published on September 12, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from flowiseai. Update flowise to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
flowiseaiflowise>= 0, < 3.1.4Affected

References

GitHubgithub.com/FlowiseAI/Flowise/security/advisories/GHSA-xhxx-56g3-mx2rRefwww.vulncheck.com/advisories/flowise-before-3.1.4-denial-of-service-via-text-to-speech-abortGitHubgithub.com/FlowiseAI/Flowise/security/advisories/GHSA-xhxx-56g3-mx2r

How CyberStrike helps

Frequently asked questions

What is CVE-2026-90535?

CVE-2026-90535 is a high-severity vulnerability affecting flowiseai flowise. It was published on September 12, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-90535?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-90535?

Check the references section for vendor advisories and patches from flowiseai. Update flowise to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-90535?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-90535 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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