CVE-2025-58434 is a critical vulnerability affecting FlowiseAI's Flowise product, versions 3.0.5 and earlier. Flowise is a drag-and-drop interface used to build customized large language model workflows. The vulnerability resides in the 'forgot-password' endpoint, which improperly exposes a valid password reset temporary token (tempToken) without requiring any authentication or verification. This flaw allows an unauthenticated attacker to generate a reset token for any user arbitrarily and reset their password, resulting in a complete account takeover (ATO). The issue affects both the cloud-hosted service (cloud.flowiseai.com) and self-hosted or local deployments that expose the same API. The root cause is a missing authentication check on a critical function (CWE-306). The vulnerability was addressed in version 3.0.6 by securing the password reset endpoints. Recommended remediation includes never returning reset tokens or sensitive account details in API responses, delivering tokens only via registered email channels, responding with generic success messages to prevent user enumeration, enforcing strong validation of reset tokens (e.g., single-use, short expiry, origin binding, and email verification), applying fixes consistently across cloud and self-hosted environments, logging and monitoring reset requests for suspicious activity, and considering multi-factor verification for sensitive accounts. The CVSS v3.1 score is 9.8 (critical), reflecting the vulnerability's ease of exploitation (no authentication or user interaction required), and its severe impact on confidentiality, integrity, and availability due to full account takeover potential.

For European organizations using FlowiseAI's Flowise platform, this vulnerability poses a significant risk of unauthorized account takeovers, potentially leading to data breaches, unauthorized access to sensitive AI workflows, and disruption of AI-driven business processes. Since Flowise is used to customize large language model flows, attackers gaining control could manipulate AI outputs, exfiltrate proprietary data, or disrupt AI services. The impact extends to both cloud and on-premises deployments, increasing the attack surface. Organizations in sectors with stringent data protection requirements, such as finance, healthcare, and government, face heightened regulatory and reputational risks if exploited. The vulnerability's ability to bypass authentication and reset passwords without user interaction makes it highly dangerous, potentially enabling widespread compromise if exploited at scale. Additionally, compromised accounts could be leveraged to launch further attacks within the organization's network or supply chain.

European organizations should immediately upgrade all Flowise deployments to version 3.0.6 or later, where the vulnerability is patched. For self-hosted instances, ensure that the password reset API endpoints are not exposed publicly or are protected behind strong network access controls. Implement strict monitoring and alerting on password reset requests to detect anomalous patterns indicative of exploitation attempts. Enforce multi-factor authentication (MFA) on all accounts, especially those with administrative or sensitive access, to mitigate the impact of potential account takeovers. Review and harden email delivery mechanisms to ensure reset tokens are only sent to verified email addresses and never exposed in API responses or logs. Conduct regular security audits and penetration tests focusing on authentication and password reset flows. Educate users about phishing risks related to password resets and encourage immediate reporting of suspicious reset emails. Finally, apply consistent security controls and patches across both cloud and self-hosted environments to avoid discrepancies that attackers could exploit.