CVE-2026-42861: CWE-284: Improper Access Control in FlowiseAI Flowise
FlowiseAI Flowise versions prior to 3.1.2 contain a mass assignment vulnerability in the variable update endpoint. Authenticated users can modify server-controlled properties such as workspaceId without proper authorization checks, allowing reassignment of variables to arbitrary workspaces. This can break tenant isolation in multi-workspace environments. The issue has been fixed in version 3.1.2.
AI Analysis
Technical Summary
CVE-2026-42861 describes an improper access control vulnerability (CWE-284) in FlowiseAI Flowise before version 3.1.2. The variable update endpoint allows authenticated users to modify sensitive server-controlled fields like workspaceId, createdDate, and updatedDate due to missing server-side validation and authorization. This mass assignment flaw enables attackers to reassign variables across workspaces, potentially violating tenant isolation in multi-tenant deployments. The vulnerability is addressed by patching to version 3.1.2.
Potential Impact
Exploitation of this vulnerability allows authenticated users to manipulate variables by changing their workspace assignment, which can lead to unauthorized access or modification of data across tenant boundaries in multi-workspace environments. This compromises tenant isolation and could result in data leakage or unauthorized data manipulation.
Mitigation Recommendations
A fix is available in FlowiseAI Flowise version 3.1.2. Users should upgrade to version 3.1.2 or later to remediate this vulnerability. Since the vendor advisory does not provide additional mitigation steps, upgrading is the primary recommended action.
CVE-2026-42861: CWE-284: Improper Access Control in FlowiseAI Flowise
Description
FlowiseAI Flowise versions prior to 3.1.2 contain a mass assignment vulnerability in the variable update endpoint. Authenticated users can modify server-controlled properties such as workspaceId without proper authorization checks, allowing reassignment of variables to arbitrary workspaces. This can break tenant isolation in multi-workspace environments. The issue has been fixed in version 3.1.2.
CVSS v4.0
Score 7.6high
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-42861 describes an improper access control vulnerability (CWE-284) in FlowiseAI Flowise before version 3.1.2. The variable update endpoint allows authenticated users to modify sensitive server-controlled fields like workspaceId, createdDate, and updatedDate due to missing server-side validation and authorization. This mass assignment flaw enables attackers to reassign variables across workspaces, potentially violating tenant isolation in multi-tenant deployments. The vulnerability is addressed by patching to version 3.1.2.
Potential Impact
Exploitation of this vulnerability allows authenticated users to manipulate variables by changing their workspace assignment, which can lead to unauthorized access or modification of data across tenant boundaries in multi-workspace environments. This compromises tenant isolation and could result in data leakage or unauthorized data manipulation.
Mitigation Recommendations
A fix is available in FlowiseAI Flowise version 3.1.2. Users should upgrade to version 3.1.2 or later to remediate this vulnerability. Since the vendor advisory does not provide additional mitigation steps, upgrading is the primary recommended action.
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: 06/08/2026, 15:48:51 UTC
Last enriched: 06/16/2026, 08:33:05 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 56
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