CVE-2025-71331CWE-80

CVE-2025-71331

Medium · published June 20, 2026

CVSS v3.1
6.1
EPSS
0%
Percentile
24.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00325 · 24.3th percentile
Weakness
CWE-80 · Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
Published
2026-06-20T20:17Z
Affected products (1)
ProductVersionsFixed in
flowiseai/flowise< 3.0.83.0.8
References (3)
https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-4fr9-3x69-36wv · [email protected]https://www.vulncheck.com/advisories/flowise-cross-site-scripting-in-chat-messages-and-agent-workflows · [email protected]https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-4fr9-3x69-36wv · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 20 JUN 15:24Z
    Flowise - Cross-Site Scripting in Chat Messages and Agent Workflows
    cvelistv5