CVE-2026-56276 Flowise CVE debrief

Who should care

Security teams and administrators responsible for Flowise installations should be aware of this vulnerability. Specifically, those who manage user accounts, authentication, and authorization within Flowise are at risk. Additionally, organizations that rely on Flowise for critical AI workflows or handle sensitive data may need to prioritize patching to prevent potential unauthorized access.

Technical summary

The vulnerability is caused by a mass assignment issue in the PUT /api/v1/user endpoint of Flowise. This allows authenticated users to directly modify the credential field without proper validation. An attacker could exploit this by supplying a crafted password hash, potentially bypassing password change verification and session invalidation mechanisms. Successful exploitation could result in persistent account access even after a temporary session compromise. The issue is resolved in Flowise version 3.1.2.

Defensive priority

Medium priority due to the need for authentication and potential for significant impact if exploited.

Recommended defensive actions

• Inventory Flowise installations and identify versions prior to 3.1.2
• Review official advisories and documentation for Flowise
• Apply the patch to upgrade Flowise to version 3.1.2 or later
• Monitor for suspicious activity related to user account modifications
• Implement compensating controls to restrict access to sensitive workflows

Evidence notes

The primary evidence for this vulnerability comes from the CVE record and NVD details. The CVE was published on June 20, 2026, and has a CVSS score of 6.0, indicating medium severity. The vulnerability affects Flowise versions prior to 3.1.2. Defenders should verify the version of Flowise in use and check for any existing patches or workarounds. Additional information can be found in the source references provided.

Official resources