← CVE Intelligence

CVE-2026-7507

Org.keycloak/keycloak-services: session fixation in oidc login flow that can lead to account takeover PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
Red Hat / Red Hat build of Keycloak 26.2unaffected 26.2.16-1 before *
Red Hat / Red Hat build of Keycloak 26.2unaffected 26.2-21 before *
Red Hat / Red Hat build of Keycloak 26.2unaffected 26.2-21 before *
Red Hat / Red Hat build of Keycloak 26.2.16unaffected
Red Hat / Red Hat build of Keycloak 26.4unaffected 26.4.12-1 before *
Red Hat / Red Hat build of Keycloak 26.4unaffected 26.4-17 before *
Red Hat / Red Hat build of Keycloak 26.4unaffected 26.4-17 before *
Red Hat / Red Hat build of Keycloak 26.4.12unaffected
Red Hat / Red Hat Single Sign-On 7.6.13unaffected
Red Hat / Red Hat Single Sign-On 7.6 for RHEL 7unaffected 0:18.0.20-1.redhat_00001.1.el7sso before *
Red Hat / Red Hat Single Sign-On 7.6 for RHEL 8unaffected 0:18.0.20-1.redhat_00001.1.el8sso before *
Red Hat / Red Hat Single Sign-On 7.6 for RHEL 9unaffected 0:18.0.20-1.redhat_00001.1.el9sso before *
Red Hat / RHEL-8 based Middleware Containersunaffected 7.6-85 before *

CWE

CWE-290

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

redhat-SADP

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.