CVE-2026-7507

Fixed in a distro release EPSS <1%CVSS 7.5

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.

Published 2026-05-19 · CVE record · OSV

Products: Red Hat build of Keycloak 26.2, Red Hat build of Keycloak 26.2.16, Red Hat build of Keycloak 26.4, Red Hat build of Keycloak 26.4.12, Red Hat Single Sign-On 7.6.13, Red Hat Single Sign-On 7.6 for RHEL 7, Red Hat Single Sign-On 7.6 for RHEL 8, Red Hat Single Sign-On 7.6 for RHEL 9, Red Hat RHEL-8 based Middleware Containers

Fixed upstream

Distro releases