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Advisories

Flowise - Cross-Site Scripting in Chat Messages and Agent Workflows

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severity
medium
date
Affecting

  • Flowise >= 0, < 3.0.8

CWE
  • CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CVSS
5.1
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Credit
quitbug
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.

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