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CVE-2026-90535

7.5 HIGHPublic exploitEPSS 0.25%
  1. Published12 Sept 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Flowiseai Flowise< 3.1.4

Remediation

Fixed in
Flowiseai Flowise≥ 3.1.4

References

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Frequently asked

Is CVE-2026-90535 being actively exploited?

CVE-2026-90535 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.25%.

How severe is CVE-2026-90535?

CVE-2026-90535 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.25% probability of exploitation.

Which products are affected by CVE-2026-90535?

Affected products include Flowiseai Flowise.

How do I fix CVE-2026-90535?

Upgrade affected software to a fixed version, for example Flowiseai Flowise 3.1.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-90535 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.