CVE-2025-3910 is a vulnerability identified in the Red Hat Build of Keycloak, specifically within the org.keycloak.authorization package. The flaw allows users to circumvent required actions during authentication workflows, notably bypassing mandatory security steps such as setting up two-factor authentication (2FA). This improper authentication vulnerability arises because the system does not adequately enforce these required actions, potentially allowing an attacker with network access and the ability to interact with the authentication process to skip critical security controls. The affected versions include 25.0.0, 26.0.0, and 26.2.0 of Keycloak. The CVSS 3.1 base score is 5.4 (medium severity), reflecting that exploitation requires no privileges but does require user interaction, and the attack vector is network-based. The impact primarily affects confidentiality and integrity, as unauthorized users could gain access to accounts or escalate privileges by bypassing 2FA or other required actions. Availability is not impacted. There are no known exploits in the wild at the time of publication, but the vulnerability poses a significant risk to organizations relying on Keycloak for identity and access management. The vulnerability was published on April 29, 2025, with no patches linked yet, indicating that remediation may still be pending or in progress. Organizations should monitor vendor advisories closely. The flaw highlights the importance of robust enforcement of authentication policies and the risks of bypassing multi-factor authentication requirements.

For European organizations, this vulnerability poses a risk to the security of identity and access management systems that rely on Keycloak, particularly those using the affected Red Hat Build versions. By circumventing required actions like 2FA setup, attackers could gain unauthorized access to sensitive systems and data, leading to potential data breaches, privilege escalation, and compliance violations under regulations such as GDPR. The confidentiality and integrity of user accounts and protected resources are at risk, potentially undermining trust in authentication mechanisms. Organizations in sectors with high security requirements—such as finance, healthcare, and government—may face increased exposure. The absence of known exploits reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits once patches are released. The medium severity score suggests a moderate but actionable risk that should be addressed promptly to prevent exploitation. Failure to mitigate could lead to unauthorized access incidents, impacting business operations and regulatory compliance.

1. Monitor Red Hat and Keycloak vendor advisories closely for official patches addressing CVE-2025-3910 and apply them immediately upon release. 2. Until patches are available, review and enforce multi-factor authentication policies at the organizational level, ensuring that 2FA is mandatory and cannot be bypassed through alternative workflows. 3. Conduct thorough audits of authentication and authorization workflows within Keycloak deployments to detect any anomalies or attempts to circumvent required actions. 4. Implement additional monitoring and alerting on authentication events to identify suspicious activities indicative of exploitation attempts. 5. Consider deploying compensating controls such as network segmentation and strict access controls around Keycloak servers to limit exposure. 6. Educate users about phishing and social engineering risks that could facilitate exploitation of authentication bypasses. 7. Evaluate the use of external identity providers or additional security layers to complement Keycloak's authentication mechanisms. 8. Maintain an incident response plan that includes scenarios involving identity and access management compromise.