CVE-2026-90535: Flowise versions before 3.1.4 contain an unauthenticated denial of service vulnerability in the /api/v1/text-t

Q: How do I fix CVE-2026-90535?

flowise: upgrade to 3.1.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-90535 being exploited?

CVE-2026-90535 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-90535 affect?

CVE-2026-90535 affects flowise. Severity is high (CVSS 7.5). 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 a

Q: How urgent is CVE-2026-90535?

Priority 47/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-90535 is a high-severity flaw (CVSS 7.5) affecting flowise. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-09-12
Last modified	2026-09-15

Publisher (CNA): VulnCheck · Vendor: flowiseai

Last updated 2026-09-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-12 13:16 UTCPublished CVE record published
2026-09-15 19:07 UTCUpdated Record last modified

flowiseai flowise UPGRADE

Affected: < 3.1.4

Fixed in: 3.1.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy flowise || rpm -q flowise || flowise --version

2. UPGRADE to 3.1.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade flowise

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade flowise

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-90535?

flowise: upgrade to 3.1.4. Exact commands for each OS are on this page.

Is CVE-2026-90535 being exploited?

CVE-2026-90535 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-90535 affect?

CVE-2026-90535 affects flowise. Severity is high (CVSS 7.5). 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 a

How urgent is CVE-2026-90535?

Priority 47/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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