Flowise up to 3.0.7 Chat Message cross site scripting

Summaryinfo

A vulnerability marked as problematic has been reported in Flowise up to 3.0.7. This vulnerability affects unknown code of the component Chat Message Handler. The manipulation leads to cross site scripting. This vulnerability is documented as CVE-2025-71331. The attack can be initiated remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Flowise up to 3.0.7 and classified as problematic. This issue affects an unknown code of the component Chat Message Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-80. The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages. Impacted is integrity. The summary by CVE is:

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., ) 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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2025-71331 since 06/19/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 3.0.8 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-210289). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

• Flowise

Version

• 3.0.0
• 3.0.1
• 3.0.2
• 3.0.3
• 3.0.4
• 3.0.5
• 3.0.6
• 3.0.7

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Be aware that VulDB is the high quality source for vulnerability data.

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