CVE-2026-42861: CWE-284: Improper Access Control in FlowiseAI Flowise
Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, a mass assignment vulnerability exists in the variable update endpoint of FlowiseAI. The endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a variable resource. Due to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign variables to arbitrary workspaces. This behavior may break tenant isolation in multi-workspace environments. This issue has been patched in version 3.1.2.
AI Analysis
Technical Summary
FlowiseAI Flowise before version 3.1.2 contains a mass assignment vulnerability in its variable update endpoint. The endpoint lacks proper server-side validation and authorization checks, enabling authenticated users to modify sensitive properties such as workspaceId, createdDate, and updatedDate. This allows attackers to reassign variables across workspaces, violating tenant isolation. The vulnerability is tracked as CVE-2026-42861 with a CVSS 4.0 score of 7.6 (high severity). The flaw has been fixed in version 3.1.2.
Potential Impact
Exploitation of this vulnerability allows authenticated users to bypass tenant isolation by reassigning variables to arbitrary workspaces. This can lead to unauthorized access or modification of data across different tenants or workspaces within the Flowise environment, potentially compromising data integrity and confidentiality in multi-tenant deployments.
Mitigation Recommendations
A fix for this vulnerability is available in Flowise version 3.1.2. Users should upgrade to version 3.1.2 or later to remediate the issue. Since this is not a cloud service, patching the affected software is required to address the vulnerability. Patch status is confirmed by the vendor advisory stating the issue is fixed in version 3.1.2.
CVE-2026-42861: CWE-284: Improper Access Control in FlowiseAI Flowise
Description
Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, a mass assignment vulnerability exists in the variable update endpoint of FlowiseAI. The endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a variable resource. Due to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign variables to arbitrary workspaces. This behavior may break tenant isolation in multi-workspace environments. This issue has been patched in version 3.1.2.
CVSS v4.0
Score 7.6high
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
FlowiseAI Flowise before version 3.1.2 contains a mass assignment vulnerability in its variable update endpoint. The endpoint lacks proper server-side validation and authorization checks, enabling authenticated users to modify sensitive properties such as workspaceId, createdDate, and updatedDate. This allows attackers to reassign variables across workspaces, violating tenant isolation. The vulnerability is tracked as CVE-2026-42861 with a CVSS 4.0 score of 7.6 (high severity). The flaw has been fixed in version 3.1.2.
Potential Impact
Exploitation of this vulnerability allows authenticated users to bypass tenant isolation by reassigning variables to arbitrary workspaces. This can lead to unauthorized access or modification of data across different tenants or workspaces within the Flowise environment, potentially compromising data integrity and confidentiality in multi-tenant deployments.
Mitigation Recommendations
A fix for this vulnerability is available in Flowise version 3.1.2. Users should upgrade to version 3.1.2 or later to remediate the issue. Since this is not a cloud service, patching the affected software is required to address the vulnerability. Patch status is confirmed by the vendor advisory stating the issue is fixed in version 3.1.2.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-30T16:44:48.379Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a26e463e29bf47b501e0dbe
Added to database: 6/8/2026, 3:48:51 PM
Last enriched: 6/8/2026, 4:06:10 PM
Last updated: 6/9/2026, 6:52:39 AM
Views: 6
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