Flowise: resetPassword Authentication Bypass Vulnerability

ZDI-CAN-28762: Flowise AccountService resetPassword Authentication Bypass Vulnerability -- ABSTRACT ------------------------------------- Trend Micro's Zero Day Initiative has identified a vulnerability affecting the following products: Flowise - Flowise -- VULNERABILITY DETAILS ------------------------ * Version tested: 3.0.12 * Installer file: hxxps://github.com/FlowiseAI/Flowise * Platform tested: NA --- ### Analysis This vulnerability allows remote attackers to bypass authentication on affected installations of FlowiseAI Flowise. Authentication is not required to exploit this vulnerability. The specific flaw exists within the resetPassword method of the AccountService class. The issue results from improper implementation of the authentication mechanism. An attacker can leverage this vulnerability to change user's passwords and bypass authentication on the system. ### Product information FlowiseAI Flowise version 3.0.12 (hxxps://github.com/FlowiseAI/Flowise) ### Setup Instructions ``` npm install flowise@3.0.12 npx flowise start ``` ### Root Cause Analysis FlowiseAI Flowise is an open source low-code tool for developers to build customized large language model (LLM) applications and AI agents. It supports integration with various LLMs, data sources, and tools in order to facilitate rapid development and deployment of AI solutions. Flowise offers a web interface with a drag-and-drop editor, as well as an API, through an Express web server accessible over HTTP on port 3000/TCP. Flowise allows users to reset forgotten passwords using a token emailed to the email address associated with their account. A token is sent to the user's email when a request is made to the "/api/v1/account/forgot-password" endpoint. Users will submit this token along with their new password to the "/api/v1/account/reset-password" endpoint, and if it is submitted within sufficient time (15 minutes by default, or the value of the PASSWORD_RESET_TOKEN_EXPIRY_IN_MINUTES environment variable) the user will be able to change their password. The resetPassword() method of the AccountService class is responsible for handling such requests. This method will first retrieve the account information of the user based on their email address, which includes the value of the reset token. The method will then check if the reset token provided matches the one stored in the user's account, and that the token hasn't expired, before changing that users password. However, there is no check performed to ensure that a password reset token has actually been generated for a user account. By default the value of the reset token stored in a users account is null, or an empty string if they've reset their password before. An attacker with knowledge of the user's email address can submit a request to the "/api/v1/account/reset-password" endpoint containing a null or empty string reset token value and reset that user's password to a value of their choosing. The null or empty string reset token value will allow the attacker to pass the reset token check, and they only have to worry about passing the expiry time check. By default the expiry time stored in the account of a user that has never generated a reset token before is equal to the time of their accounts creation plus 15 minutes (or the value of the PASSWORD_RESET_TOKEN_EXPIRY_IN_MINUTES environment variable). This means that an attacker with knowledge of a recently created user account's email can change the user's password and use the changed password to bypass authentication. comments documenting the issue have been added to the following code snippet. Added comments are prepended with "!!!". From packages/server/src/enterprise/services/account.service.ts ```ts public async resetPassword(data: AccountDTO) { data = this.initializeAccountDTO(data) const queryRunner = this.dataSource.createQueryRunner() await queryRunner.connect() try { const user = await this.

CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity from

GitHub (reviewed advisory)

Weakness

CWE-287

Also known as

CVE-2026-41276

• github.com/FlowiseAI/Flowise/security/advisories/GHSA-f6hc-c5jr-878p
• nvd.nist.gov/vuln/detail/CVE-2026-41276
• github.com/FlowiseAI/Flowise