Threats Tagged 'cve-2026-7507'

A session fixation vulnerability was found in Keycloak's login-actions endpoints. An unauthenticated attacker could exploit this flaw by pre-creating an authentication session and tricking a victim into visiting a maliciously crafted link. By leveraging the /login-actions/restart endpoint—which processes session handles without adequate CSRF protection or cookie ownership validation—an attacker can reset the authentication flow state. This causes Single Sign-On (SSO) to authenticate the victim transparently upon clicking the link, allowing the attacker to hijack the required-action form without needing the victim's credentials. A successful exploit could lead to complete account takeover, including highly privileged administrative accounts.

Red Hat build of Keycloak is an integrated sign-on solution, available as a Red Hat JBoss Middleware for OpenShift containerized image. The Red Hat build of Keycloak for OpenShift image provides an authentication server that you can use to log in centrally, log out, and register. You can also manage user accounts for web applications, mobile applications, and RESTful web services. Red Hat build of Keycloak Operator for OpenShift simplifies deployment and management of Keycloak 26.4.12 clusters. This erratum releases new images for Red Hat build of Keycloak 26.4.12 for use within the OpenShift Container Platform cloud computing Platform-as-a-Service (PaaS) for on-premise or private cloud deployments, aligning with the standalone product release. Security fixes: * Denial of Service via specially crafted SAML input (CVE-2026-7307) * Information Disclosure via evaluate-scopes Admin API (CVE-2026-37978) * Unauthorized account takeover via WebAuthn token replay (CVE-2026-37982) * Information disclosure via OIDC token introspection endpoint audience bypass (CVE-2026-37979) * Access token disclosure and implicit flow bypass via forged client data (CVE-2026-7571) * Session fixation in OIDC login flow that can lead to account takeover (CVE-2026-7507) * Open redirect when using wildcard valid redirect URIs in Keycloak (CVE-2026-7504) * Information disclosure via broken access control in user lookup endpoint (CVE-2026-37981) * Unauthorized resource access and data modification via Insecure Direct Object Reference (CVE-2026-4630)

Red Hat has released a security update for the Red Hat build of Keycloak 26.2.16 images used within OpenShift Container Platform. The update addresses three vulnerabilities: a denial of service via specially crafted SAML input (CVE-2026-7307), a session fixation vulnerability in the OIDC login flow that can lead to account takeover (CVE-2026-7507), and an open redirect issue when using wildcard valid redirect URIs (CVE-2026-7504). These issues affect the authentication and session management components of Keycloak, potentially impacting user account security and service availability.

A flaw was found in Keycloak. A remote, unauthenticated attacker can send a specially crafted XML input to the Security Assertion Markup Language (SAML) endpoint. This malicious input can cause high CPU usage and worker thread starvation, leading to a Denial of Service (DoS) where the server becomes unavailable.