What is CVE-2025-71331?

CVE-2025-71331 is a medium-severity vulnerability in Flowise, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 6.1/10. Published 2026-06-20.

How severe is CVE-2025-71331?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Flowise

CVE-2025-71331

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., <i…

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Flowise — versions 0, 3.0.8

Weakness classification (CWE)

CWE-80 — Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2025-71331?: CVE-2025-71331 is a medium-severity vulnerability in Flowise, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 6.1/10. Published 2026-06-20.
How severe is CVE-2025-71331?: Medium severity. CVSS v3 base score is 6.1 out of 10.