CVE-2026-42862: 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 tool update endpoint of FlowiseAI. The endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a tool resource. Due to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign tools to arbitrary workspaces. This breaks tenant isolation in multi-workspace environments. This issue has been patched in version 3.1.2.
AI Analysis
Technical Summary
FlowiseAI's Flowise, a drag-and-drop interface for building large language model flows, had a mass assignment vulnerability in its tool update endpoint before version 3.1.2. The endpoint allowed authenticated users to modify sensitive server-controlled fields such as workspaceId without proper server-side validation or authorization checks. This flaw enables attackers to reassign tools to different workspaces, violating tenant isolation in environments with multiple workspaces. The vulnerability is tracked as CVE-2026-42862 with a CVSS 4.0 score of 7.6 (high severity). The issue has been patched in Flowise version 3.1.2.
Potential Impact
Exploitation of this vulnerability allows authenticated users to bypass tenant isolation by reassigning tools to arbitrary workspaces. This could lead to unauthorized access or modification of resources across workspace boundaries in multi-tenant deployments. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade Flowise to version 3.1.2 or later, where this vulnerability has been patched. Since the vendor advisory indicates the issue is fixed in version 3.1.2, applying this official update is the recommended remediation. No additional mitigations are specified.
CVE-2026-42862: 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 tool update endpoint of FlowiseAI. The endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a tool resource. Due to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign tools to arbitrary workspaces. This breaks 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's Flowise, a drag-and-drop interface for building large language model flows, had a mass assignment vulnerability in its tool update endpoint before version 3.1.2. The endpoint allowed authenticated users to modify sensitive server-controlled fields such as workspaceId without proper server-side validation or authorization checks. This flaw enables attackers to reassign tools to different workspaces, violating tenant isolation in environments with multiple workspaces. The vulnerability is tracked as CVE-2026-42862 with a CVSS 4.0 score of 7.6 (high severity). The issue has been patched in Flowise version 3.1.2.
Potential Impact
Exploitation of this vulnerability allows authenticated users to bypass tenant isolation by reassigning tools to arbitrary workspaces. This could lead to unauthorized access or modification of resources across workspace boundaries in multi-tenant deployments. There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade Flowise to version 3.1.2 or later, where this vulnerability has been patched. Since the vendor advisory indicates the issue is fixed in version 3.1.2, applying this official update is the recommended remediation. No additional mitigations are specified.
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: 6a26e463e29bf47b501e0dc2
Added to database: 6/8/2026, 3:48:51 PM
Last enriched: 6/8/2026, 4:06:04 PM
Last updated: 6/9/2026, 4:58:02 AM
Views: 5
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