CVE-2025-71331
Flowise - Cross-Site Scripting in Chat Messages and Agent Workflows
- State
- Published
- Severity
- 5.1 Medium
- Published
- Jun 20, 2026
- Updated
- Jun 22, 2026
- Reserved
- Jun 19, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.1 Medium | 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 | VulnCheck |
| 3.1 | 6.1 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
Affected Products
| Product | Versions |
|---|---|
FlowiseFlowise |
|
References
- GHSA Advisory GHSA-4fr9-3x69-36wvvendor-advisory
- VulnCheck Advisory: Flowise - Cross-Site Scripting in Chat Messages and Agent Workflowsthird-party-advisory
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