CVE-2026-90535 Flowise - Denial of Service

Flowise < 3.1.4 contains an unauthenticated denial of service vulnerability caused by lack of ownership verification in /api/v1/text-to-speech/abort endpoint, letting attackers terminate active chatflow predictions, exploit requires known chatflow and chat identifiers.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
Proof of concept available
EPSS
0.48% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
12 September 2026
Updated
15 October 2026
Weakness
CWE-862

Vendor fix

Update to version 3.1.4 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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