CVE-2025-71331 - CVE House
Back to Database
Status published Medium CVE-2025-71331

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

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2025-71331

Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • quitbug

References

More from Flowise

View All →
CVE-2025-71338
Flowise - Arbitrary File Write to Remote Code Execution via document-store API
Critical 10
CVE-2025-71337
Flowise - Unverified Email Change via Account Profile Endpoint
High 8.7
CVE-2025-71336
Flowise - Unsandboxed Remote Code Execution via Custom MCP
Critical 9.3
CVE-2025-71335
Flowise - Session Invalidation Failure After Password Change
High 8.6
CVE-2025-71334
Flowise - Arbitrary File Access via Missing Chat Flow ID Validation
Critical 9.3

Affected Vendor

Affected Software

Flowise
Vulnerable Versions:
0, 3.0.8

Timeline

Official Publish: June 20th, 2026
Last Modified: June 22nd, 2026
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weaknesses (CWE)

CWE-80

MITRE ATT&CK TTPs

T1189 Drive-by Compromise
Initial Access
T1059 Command and Scripting Interpreter
Execution
T1552 Unsecured Credentials
Credential Access
T1071 Application Layer Protocol
Command and Control
T1565 Data Manipulation
Impact