Search: CVE-2026-7571

CVE-2026-7571 is a vulnerability in Red Hat build of Keycloak 26.4 where a low-privilege user can bypass a security control designed to disable the implicit flow in OpenID Connect clients. By manipulating client data during a session restart, the attacker can obtain access tokens that should be unavailable. These tokens may also be exposed in server logs, proxy logs, and HTTP Referrer headers, leading to sensitive information disclosure. The vulnerability has a CVSS score of 7.1, indicating high severity. Red Hat has released updated packages (Keycloak 26.4.12) addressing this and other related security issues. Users are advised to apply these updates after backing up their installations.