CVE-2026-42861
Flowise: Mass Assignment in Variable Update Endpoint Allows Cross-Workspace Resource Reassignment
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.
INFO
Published Date :
June 8, 2026, 4:16 p.m.
Last Modified :
July 23, 2026, 7:10 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Flowise to version 3.1.2 or later.
- Ensure server-side validation is enforced.
- Implement proper authorization checks.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-42861.
| URL | Resource |
|---|---|
| https://github.com/FlowiseAI/Flowise/releases/tag/flowise%403.1.2 | Product Release Notes |
| https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-6fw7-3q8r-m5vj | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-42861 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-42861
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-42861 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-42861 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 23, 2026
Action Type Old Value New Value Added Translation Title: Flowise de FlowiseAI, Description: Flowise es una interfaz de usuario de arrastrar y soltar para construir un flujo de modelo de lenguaje grande personalizado. Antes de la versión 3.1.2, existe una vulnerabilidad de asignación masiva en el endpoint de actualización de variables de FlowiseAI. El endpoint permite a los usuarios autenticados modificar propiedades controladas por el servidor como workspaceId, createdDate y updatedDate al actualizar un recurso de variable. Debido a la falta de validación del lado del servidor y de comprobaciones de autorización, un atacante puede manipular el campo workspaceId y reasignar variables a espacios de trabajo arbitrarios. Este comportamiento puede romper el aislamiento de inquilinos en entornos multi-espacio de trabajo. Este problema ha sido parcheado en la versión 3.1.2. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'FlowiseAI', 'product': 'Flowise', 'versions': [{'status': 'affected', 'version': '< 3.1.2'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-42861', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-09T15:27:50.174421Z'} -
Initial Analysis by [email protected]
Jun. 11, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N Added CPE Configuration OR *cpe:2.3:a:flowiseai:flowise:*:*:*:*:*:*:*:* versions up to (excluding) 3.1.2 Added Reference Type GitHub, Inc.: https://github.com/FlowiseAI/Flowise/releases/tag/flowise%403.1.2 Types: Product, Release Notes Added Reference Type GitHub, Inc.: https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-6fw7-3q8r-m5vj Types: Exploit, Vendor Advisory -
New CVE Received by [email protected]
Jun. 08, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-284 Added CWE CWE-639 Added CWE CWE-915 Added Reference https://github.com/FlowiseAI/Flowise/releases/tag/flowise%403.1.2 Added Reference https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-6fw7-3q8r-m5vj