CVE-2025-62398 is a medium-severity authentication vulnerability identified in versions 4.4.0, 4.5.0, and 5.0.0 of a software product (unnamed in the provided data). The vulnerability allows attackers who already possess valid credentials to bypass multi-factor authentication mechanisms under specific conditions, effectively reducing the security posture of affected accounts. The flaw does not require user interaction, and the attacker must have some level of privileges (PR:L in CVSS), meaning the attacker needs to have legitimate credentials but can then circumvent the second authentication factor. The CVSS vector (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N) indicates network attack vector, low attack complexity, privileges required, no user interaction, unchanged scope, and limited impact on confidentiality and integrity, with no availability impact. This suggests that while the vulnerability does not allow remote unauthenticated attackers to exploit it, it significantly weakens MFA protections for users who have compromised credentials. No public exploits have been reported yet, but the potential for misuse exists, especially in environments relying heavily on MFA for securing sensitive accounts. The lack of patch links in the data suggests that remediation guidance or patches may not have been publicly released at the time of this report, emphasizing the need for vigilance and interim mitigations.

For European organizations, this vulnerability poses a risk of unauthorized account access despite MFA protections, which are widely adopted as a standard security measure. Attackers who have obtained valid credentials through phishing, credential stuffing, or insider threats could exploit this flaw to bypass MFA and gain access to sensitive systems and data. This could lead to data breaches, unauthorized transactions, or lateral movement within networks. Sectors such as finance, government, healthcare, and critical infrastructure in Europe, which rely heavily on MFA for compliance and security, could face increased risk. The medium severity rating reflects limited direct impact on availability but a meaningful threat to confidentiality and integrity. The absence of known exploits reduces immediate risk but does not eliminate the potential for future attacks, especially as threat actors often target MFA bypass vulnerabilities to escalate privileges and maintain persistence.

European organizations should immediately verify if they are running affected versions (4.4.0, 4.5.0, 5.0.0) of the vulnerable software and prioritize upgrading to patched versions once available. In the absence of official patches, organizations should enforce additional compensating controls such as: 1) Implementing stricter credential hygiene policies including mandatory password resets and enhanced monitoring for suspicious login activity. 2) Deploying anomaly detection systems to identify unusual authentication patterns or access from unexpected locations/devices. 3) Restricting access to sensitive systems via network segmentation and zero-trust principles to limit lateral movement if accounts are compromised. 4) Increasing user awareness and training to reduce credential theft risks. 5) Utilizing hardware-based MFA tokens or biometric factors that may be less susceptible to bypass techniques. 6) Monitoring vendor advisories closely for patch releases and applying them promptly. 7) Conducting regular penetration testing and red team exercises to evaluate the effectiveness of MFA implementations and detect bypass attempts.