Vulnerability Report

CVE-2026-42862

Title: Mass Assignment in FlowiseAI Tool Update Endpoint

Other

Proof Of Concept

No public PoC currently indexed for CVE-2026-42862.

CWE Category CWE-284

Published Date Jun 08, 2026

Modified Date Jul 23, 2026

Exploit Status Not Found

Score 7.6 CVSS v4.0

Exploit Probability (EPSS)

0.19%

Vulnerability Summary

CVE-2026-42862: 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.

Impacted Vendors

flowiseai 1

Reference Links

https://github.com/FlowiseAI/Flowise/releases/tag/flowise%403.1.2 https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-x5v6-pj28-cwwm

CVSS v4.0

Source Entity [email protected]

Severity HIGH

7.6

Attack Vector

NETWORK

Complexity

HIGH

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

N/A

RAW VECTOR

CVSS:4.0/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

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

5.0