CVE-2025-71331

Medium

Description

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.

SeverityMedium

CVSS6.1

Exploit probability—

ProductFlowise

PublishedJun 20, 2026

First seenJun 20, 2026

Weakness typeCWE-80CWE-80

How to fix

Update

flowiseai flowise3.0.8 or later
flowise3.0.8 or later

Vendor advisories

github.com/FlowiseAI/Flowise/security/advisories/GHSA-4fr9-3x69-36wv

Affected products

Product	Affected versions	Fixed in
flowiseai flowise	v < 3.0.8	3.0.8
flowisenpm	v < 3.0.8	3.0.8

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