Auth bypass in Flowiseai Flowise
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (18.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 18.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Flowiseai Flowise — versions < 3.1.2
Weakness classification (CWE)
References
- github.com/FlowiseAI/Flowise/releases/tag/flowise@3.1.2 (Product, Release Notes)
- github.com/FlowiseAI/Flowise/security/advisories/GHSA-x5v6-pj28-cwwm (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-42862?
- CVE-2026-42862 is a medium-severity vulnerability in Flowiseai Flowise, classified under Improper Access Control. CVSS score: 5.0/10. Published 2026-06-08.
- How severe is CVE-2026-42862?
- Medium severity. CVSS v3 base score is 5.0 out of 10.