CVE-2026-90533Network attack vectorHinoki check available

Owner account takeover via unsanitized user record

Published Sep 12, 2026 · Updated Sep 12, 2026

Broken access control in Flowise before 3.1.4 allows remote authenticated users to retrieve the organization owner's full user record. OrganizationUserService assigned the owner's unsanitized user entity to the response instead of passing a copy through sanitizeUser. Any authenticated organization member can supply a user ID, obtain the owner's bcrypt hash and temporary tokens, and use cracked credentials to take over the highest-privileged account.

CVSS severityUnavailable
Unscored
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Broken access control in Flowise before 3.1.4 allows remote authenticated users to retrieve the organization owner's full user record. OrganizationUserService assigned the owner's unsanitized user entity to the response instead of passing a copy through sanitizeUser. Any authenticated organization member can supply a user ID, obtain the owner's bcrypt hash and temporary tokens, and use cracked credentials to take over the highest-privileged account.

The record

CVE
CVE-2026-90533
Published
Sep 12, 2026
Updated
Sep 12, 2026
Vendor
FlowiseAI
Product
Flowise
Classifications
T1555
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.1.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

FlowiseAI · Flowiseversion=0 <3.1.4

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1555Credentials from Password Stores

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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