Threats Tagged 'cve-2026-15571'

A vulnerability in the legacy client-initiated account-linking endpoint of Keycloak allows a malicious OpenID Connect (OIDC) client to predict the hash protecting the account-linking process. This flaw enables an attacker to forge a valid linking URL after tricking a user into authenticating, resulting in full account takeover by linking the victim's account to the attacker's external identity. The issue affects Keycloak versions prior to 26.7.2. Official patches are available from Red Hat for the affected versions.

Multiple critical security vulnerabilities have been identified in Red Hat build of Keycloak 26.6.6 images used within OpenShift Container Platform. These include privilege escalation via a TOCTOU vulnerability, unauthenticated account takeover, leakage of rotated client secrets, predictable account-linking hashes enabling account takeover, and unauthorized disclosure of hidden group metadata. Red Hat has released updated container images to address these issues for on-premise and private cloud deployments.

CVE-2026-15571 is a vulnerability in the legacy client-initiated account-linking endpoint of Red Hat build of Keycloak 26.6. The flaw allows a malicious OpenID Connect (OIDC) client to predict the hash used to protect the account-linking process. By tricking a user into authenticating, the attacker can forge a valid linking URL, linking the victim's account to an attacker-controlled external identity, resulting in full account takeover.

Red Hat has issued a critical security update for its build of Keycloak 26.6.6, addressing multiple vulnerabilities including privilege escalation via a TOCTOU flaw, unauthenticated account takeover, information disclosure, and predictable hashes enabling account takeover. The update fixes five CVEs affecting authentication and authorization components. Users are advised to back up their installations before applying the update.