Cross-site scripting in Flowise - CVE-2025-50538
Published: May 4, 2026
Vulnerability identifier: #VU129620
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2025-50538
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: FlowiseAI
Affected software:
Flowise
Flowise
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary JavaScript in an administrator's browser and disclose sensitive information.
The vulnerability exists due to cross-site scripting in the "View Messages" functionality of the admin interface when rendering stored user messages. A remote attacker can send a specially crafted message payload to execute arbitrary JavaScript in an administrator's browser and disclose sensitive information.
User interaction is required when an administrator clicks the "View Messages" button in the workflow UI. Sensitive data stored in localStorage may be exposed.
How to mitigate CVE-2025-50538
Install security update from vendor's website.