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.
Affected products
redhat: build of keycloak
References10
- access.redhat.com/errata/RHSA-2026:19594 Vendor Advisory
- access.redhat.com/errata/RHSA-2026:19595 Vendor Advisory
- access.redhat.com/errata/RHSA-2026:19596 Vendor Advisory
- access.redhat.com/errata/RHSA-2026:19597 Vendor Advisory
- access.redhat.com/security/cve/CVE-2026-7507 Vendor Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2464145 Vendor Advisory
- access.redhat.com/errata/RHSA-2026:19594 Vendor Advisory
- access.redhat.com/errata/RHSA-2026:19595 Vendor Advisory
- access.redhat.com/errata/RHSA-2026:19596 Vendor Advisory
- access.redhat.com/errata/RHSA-2026:19597 Vendor Advisory
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 1% percentile: 58 · as of 14 November 2026
- CWE
- CWE-290
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