Vulnerability · Published Jun 8, 2026 · Assigned by GitHub_M

CVE-2026-42862Flowise: Mass Assignment in Tool Update Endpoint Allows Cross-Workspace Resource Reassignment

High 7.6

In plain English

A high-severity improper access control in Flowise from FlowiseAI. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)7.6High

Exploit odds (30 days)0.2%top 90.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	flowise	3.1.2	GHSA-x5v6-pj28-cwwm

Affected products (as reported)

Vendor	Product	Versions
FlowiseAI	Flowise	< 3.1.2

Weakness: CWE-284, CWE-639, CWE-915 · 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

References

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