CVE-2025-71331: Flowiseai Flowise

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Flowise before 3.0.8 contains a cross-site scripting (XSS) vulnerability caused by insufficient input filtering in chat messages and custom agent functions. An attacker can inject malicious JavaScript by sending an iframe payload (e.g., <iframe src="javascript:alert(document.cookie)">) in a chat box, or by having a custom agent function return an XSS payload from an external website. The injected script executes in the victim's browser, enabling theft of cookies and session data.

Affected products

• Flowiseai Flowise: before 3.0.8 (fixed in 3.0.8)

Published 2026-06-20. Last modified 2026-06-23.