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[CVE-2026-7507] Session fixation in OIDC login flow leading to account takeover #49111
Description
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.
Activity
[-][CVE-2026-7507] [Vulnerability Report[/-][+][CVE-2026-7507] Session fixation in OIDC login flow leading to account takeover[/+]Better check for authSessionCookie in SessionCodeChecks (#603) (#49134)
17 remaining items
Better check for authSessionCookie in SessionCodeChecks (keycloak#603) (