CVE-2025-3910 is an authentication bypass vulnerability identified in the Red Hat Build of Keycloak, specifically within the org.keycloak.authorization package. Keycloak is a widely used open-source identity and access management solution that provides single sign-on, authentication, and authorization services. The vulnerability allows an attacker to circumvent required actions that are normally enforced during user authentication workflows, such as mandatory two-factor authentication (2FA) setup. This bypass means that a user could avoid completing security steps intended to strengthen account protection, potentially gaining unauthorized access or reducing the security posture of the system. The flaw affects versions 25.0.0, 26.0.0, and 26.2.0 of the product. According to the CVSS v3.1 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N), the vulnerability can be exploited remotely over the network with low attack complexity, requires no privileges but does require user interaction, and impacts confidentiality and integrity to a limited extent without affecting availability. No known exploits have been reported in the wild as of the publication date. The vulnerability was published on April 29, 2025, and is tracked under CVE-2025-3910. The absence of patches at the time of reporting suggests that organizations should monitor vendor advisories closely and prepare to apply updates promptly. The vulnerability highlights the importance of robust enforcement of authentication policies within identity management platforms.

The primary impact of CVE-2025-3910 is the potential circumvention of security controls designed to enforce multi-factor authentication and other required user actions during login. This can lead to unauthorized access if an attacker or malicious insider exploits the flaw to bypass 2FA setup or other mandatory security steps. The confidentiality of user accounts and sensitive data may be compromised, and the integrity of authentication workflows undermined. Although availability is not directly affected, the breach of authentication controls can facilitate further attacks, lateral movement, or privilege escalation within an organization’s network. Organizations relying on Keycloak for identity and access management, especially those enforcing strict authentication policies, face increased risk of account compromise and reduced trust in their security posture. The medium CVSS score reflects moderate risk, but the widespread use of Keycloak in enterprise and cloud environments amplifies the potential impact. The lack of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits once patches are released.

1. Monitor Red Hat and Keycloak vendor advisories closely for official patches addressing CVE-2025-3910 and apply them promptly once available. 2. Until patches are released, implement compensating controls such as enforcing multi-factor authentication at the network or application gateway level to ensure 2FA cannot be bypassed. 3. Conduct thorough audits of authentication workflows and logs to detect any attempts to circumvent required actions. 4. Restrict access to Keycloak administrative interfaces and APIs to trusted networks and users to reduce attack surface. 5. Employ anomaly detection and behavioral analytics to identify suspicious authentication patterns indicative of exploitation attempts. 6. Educate users about phishing and social engineering risks, as user interaction is required for exploitation. 7. Consider deploying Web Application Firewalls (WAFs) with custom rules to detect and block suspicious requests targeting authorization flows. 8. Review and tighten authorization policies within Keycloak to minimize the impact of any bypass. 9. Maintain an incident response plan that includes procedures for compromised identity management systems. 10. Regularly update and patch all related infrastructure components to reduce overall risk exposure.