Auth bypass in Flowiseai Flowise
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (28.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.0% 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: 0.004 · change: +0.001
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-5wxp-qjgq-fx6m (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-42863?
- CVE-2026-42863 is a high-severity vulnerability in Flowiseai Flowise, classified under Improper Access Control. CVSS score: 8.1/10. Published 2026-06-08.
- How severe is CVE-2026-42863?
- High severity. CVSS v3 base score is 8.1 out of 10.