Vulnerability Report

CVE-2026-42863

Title: Mass Assignment in FlowiseAI Chatflow Update Endpoint

Other

Proof Of Concept

No public PoC currently indexed for CVE-2026-42863.

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)

0.27%

Vulnerability Summary

CVE-2026-42863: 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 chatflow update endpoint of FlowiseAI. The endpoint allows clients to modify server-controlled properties such as deployed, isPublic, workspaceId, createdDate, and updatedDate when updating a chatflow object. Due to missing server-side validation and authorization checks, an authenticated user can manipulate internal attributes of a chatflow and reassign it to another workspace. This allows cross-workspace resource reassignment and unauthorized modification of deployment and visibility settings. 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-5wxp-qjgq-fx6m

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