CVE-2026-7507

published 2026-05-19

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…

Priority P3 50 high 7.5 CVSS 3.1

AV N AC H PR N UI R S U C H I H A H

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

2 ranges

Vendor	Product	Version range	Fixed in
redhat	build_of_keycloak	>= 26.4 < 26.4.12	26.4.12
rhbk	keycloak-rhel9-operator	—	—

CVSS provenance

nvd v3.1 7.5 HIGH CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

vendor_redhat 7.5 HIGH

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