CVE-2026-3047 is a critical authentication bypass vulnerability identified in the Red Hat build of Keycloak version 26.2, specifically within the org.keycloak.broker.saml module. The vulnerability arises when a Security Assertion Markup Language (SAML) client, which has been disabled, is still configured as an Identity Provider (IdP)-initiated broker landing target. Under normal circumstances, a disabled client should not allow login or session establishment. However, due to this flaw, an attacker can exploit the misconfiguration to complete the login process and establish a Single Sign-On (SSO) session without proper authentication. This effectively bypasses security restrictions designed to prevent unauthorized access to enabled clients. The vulnerability allows a remote attacker with at least some privileges (PR:L) to gain unauthorized access to other enabled clients without requiring user interaction (UI:N). The CVSS v3.1 score of 8.8 reflects the high impact on confidentiality, integrity, and availability, as unauthorized session establishment can lead to data exposure, privilege escalation, and potential service disruption. The flaw is particularly concerning in environments where Keycloak is used as a central authentication broker for multiple applications and services, as it undermines the trust model of SSO. Although no known exploits are currently reported in the wild, the vulnerability's nature and high severity necessitate immediate attention. The vulnerability was publicly disclosed on March 5, 2026, and no patch links were provided in the source information, indicating that organizations should monitor Red Hat advisories closely for updates.

The impact of CVE-2026-3047 is significant for organizations relying on Red Hat's Keycloak 26.2 for identity and access management, particularly those using SAML-based SSO configurations. Unauthorized access to enabled clients without re-authentication can lead to data breaches, unauthorized actions within applications, and compromise of sensitive information. The integrity of authentication processes is undermined, potentially allowing attackers to impersonate legitimate users or escalate privileges. Availability may also be affected if attackers disrupt sessions or services after gaining unauthorized access. This vulnerability can facilitate lateral movement within enterprise environments, increasing the risk of broader compromise. Organizations in sectors with stringent access control requirements, such as finance, healthcare, government, and critical infrastructure, face elevated risks. The ease of exploitation (network accessible, low complexity) combined with the high impact on confidentiality, integrity, and availability makes this a critical concern for global enterprises using Keycloak as an authentication broker.

To mitigate CVE-2026-3047, organizations should immediately review their Keycloak SAML client configurations, ensuring that disabled clients are not set as IdP-initiated broker landing targets. Until an official patch is released by Red Hat, consider disabling or removing any unused or disabled SAML clients from broker configurations to prevent exploitation. Implement strict access controls and monitoring on the Keycloak administration interfaces to limit who can modify broker settings. Enable detailed logging and alerting on authentication events to detect anomalous login patterns indicative of exploitation attempts. Network segmentation and firewall rules should restrict access to Keycloak servers to trusted administrators and systems only. Organizations should subscribe to Red Hat security advisories and apply patches promptly once available. Additionally, consider implementing multi-factor authentication (MFA) on Keycloak to add an extra layer of security, reducing the risk of unauthorized session establishment. Conduct regular security audits and penetration testing focused on SSO and broker configurations to identify and remediate similar misconfigurations.