PT-2026-40977 · Flowiseai+2 · Flowise

CVE-2026-42863 · Published 2026-05-14 · Updated 2026-06-11

Positive Technologies (AI Summary)

CVSS v3.1

8.1

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Name of the Vulnerable Software and Affected Versions Flowise versions prior to 3.1.2

Description A mass assignment issue exists in the chatflow update endpoint. This occurs when an application takes user-provided data and applies it to an internal object without sufficient filtering, allowing users to modify fields they should not have access to. An authenticated user can manipulate internal attributes of a chatflow via the '/api/v1/chatflows/{chatflowId}' endpoint by injecting server-controlled variables such as deployed, isPublic, workspaceId, createdDate, updatedDate, category, and type. Due to missing server-side validation and authorization checks, this allows for unauthorized modification of deployment and visibility settings, as well as cross-workspace resource reassignment, which breaks tenant isolation boundaries in multi-tenant environments.

Recommendations Update to version 3.1.2.

Exploit

Fix

Improper Access Control

IDOR

Weakness Enumeration

CWE-284

CWE-639

CWE-915

Related Identifiers

CVE-2026-42863

GHSA-5WXP-QJGQ-FX6M

Affected Products

Flowise

References · 9

• 🔥 https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-5wxp-qjgq-fx6m · Exploit
• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42863.json · Exploit
• https://osv.dev/vulnerability/CVE-2026-42863 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-42863 · Security Note
• https://osv.dev/vulnerability/GHSA-5wxp-qjgq-fx6m · Vendor Advisory
• https://github.com/FlowiseAI/Flowise/releases/tag/flowise%403.1.2 · Note
• https://github.com/FlowiseAI/Flowise · Note
• https://t.me/cveNotify/167006 · Telegram Post
• https://t.me/cveNotify/166615 · Telegram Post