CVE-2025-58434: Flowiseai Flowise Auth Bypass Vulnerability

CVE-2025-58434 Overview

CVE-2025-58434 is a critical authentication bypass vulnerability in Flowise, the popular drag-and-drop user interface for building customized large language model (LLM) flows. The vulnerability exists in the forgot-password endpoint, which improperly returns sensitive password reset tempToken values directly in API responses without authentication or verification. This broken access control flaw enables attackers to generate valid password reset tokens for arbitrary users, allowing complete account takeover (ATO) with no prior authentication required.

Critical Impact

Unauthenticated attackers can fully compromise any Flowise user account by exploiting the exposed password reset token, gaining complete control over LLM workflows and sensitive data.

Affected Products

• Flowise versions 3.0.5 and earlier
• FlowiseAI Cloud Service (cloud.flowiseai.com)
• Self-hosted and local Flowise deployments exposing the vulnerable API

Discovery Timeline

• 2025-09-12 - CVE-2025-58434 published to NVD
• 2025-09-20 - Last updated in NVD database

Technical Details for CVE-2025-58434

Vulnerability Analysis

This vulnerability is classified under CWE-306 (Missing Authentication for Critical Function). The core issue lies in the architectural design of the password reset flow, where the forgot-password API endpoint returns the actual password reset token (tempToken) directly in the HTTP response body. In secure implementations, password reset tokens should only be delivered through authenticated channels such as email to the registered account holder.

The flaw allows any unauthenticated remote attacker to request a password reset for any known username or email address, receive the valid reset token immediately in the API response, and then use that token to reset the victim's password. This represents a complete bypass of the authentication mechanism and results in full account takeover.

Root Cause

The root cause is a missing authentication check and improper information exposure in the password reset functionality. The application failed to implement proper security controls that would restrict token delivery to authorized channels only. The forgot-password endpoint was designed to return sensitive account details including the temporary reset token directly to the caller, regardless of their identity or authorization level.

Attack Vector

The attack exploits the network-accessible forgot-password API endpoint. An attacker can target both the FlowiseAI cloud service and any self-hosted Flowise deployments with the vulnerable API exposed. The attack requires no authentication, no user interaction, and can be executed with low complexity. The attacker simply sends a request to the forgot-password endpoint with a target user's email or username, receives the valid tempToken in the response, and uses it to reset the victim's password via the corresponding reset endpoint.

// Security fix: Adding sanitization to user service
// Source: https://github.com/FlowiseAI/Flowise/commit/9e178d68873eb876073846433a596590d3d9c863

import { generateId } from '../../utils'
import { GeneralErrorMessage } from '../../utils/constants'
import { getHash } from '../utils/encryption.util'
+import { sanitizeUser } from '../../utils/sanitize.util'

export const enum UserErrorMessage {
    EXPIRED_TEMP_TOKEN = 'Expired Temporary Token',

The patch introduces a sanitizeUser utility function that filters sensitive data from API responses, ensuring tokens and other confidential information are no longer exposed to unauthenticated callers.

Detection Methods for CVE-2025-58434

Indicators of Compromise

• Unusual volume of requests to the /api/v1/forgot-password endpoint from single IP addresses or IP ranges
• Password reset requests for multiple user accounts originating from the same source
• Successful password resets without corresponding legitimate email confirmations from users
• Login activity from unexpected geographic locations following password reset operations

Detection Strategies

• Implement rate limiting and anomaly detection on the forgot-password endpoint to identify brute-force attempts
• Monitor API access logs for patterns indicating token harvesting activities
• Correlate password reset requests with email delivery logs to identify resets that bypass email verification
• Alert on multiple failed or successful password resets for different accounts from similar sources

Monitoring Recommendations

• Enable detailed logging for all authentication and password reset endpoints
• Deploy Web Application Firewall (WAF) rules to detect and block suspicious password reset patterns
• Implement real-time alerting for account takeover indicators such as rapid password changes followed by profile modifications
• Monitor for unusual API access patterns targeting enterprise and admin accounts

How to Mitigate CVE-2025-58434

Immediate Actions Required

• Upgrade Flowise to version 3.0.6 or later which contains the security fix (commit 9e178d68873eb876073846433a596590d3d9c863)
• Review recent password reset logs for signs of exploitation
• Force password resets for any accounts that may have been compromised
• Consider temporarily disabling the forgot-password endpoint until patching is complete

Patch Information

FlowiseAI has addressed this vulnerability in version 3.0.6. The fix is available in commit 9e178d68873eb876073846433a596590d3d9c863, which secures password reset endpoints by implementing proper sanitization. The patch adds the sanitizeUser utility to filter sensitive information from API responses. Organizations should review the GitHub Security Advisory and apply the security patch immediately.

Workarounds

• Restrict network access to Flowise instances using firewall rules or VPN requirements until patching is complete
• Implement a reverse proxy with rate limiting and monitoring in front of the Flowise API
• Disable the forgot-password functionality temporarily by modifying application configuration or routing rules
• Enable multi-factor authentication (MFA) for all accounts if available, reducing the impact of password-only compromises

# Example: Block access to vulnerable endpoint via nginx until patched
location /api/v1/forgot-password {
    # Temporarily deny all access to vulnerable endpoint
    deny all;
    return 503;
}