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This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.
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.
Metrics
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[{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.2","defaultStatus":"affected","cpes":["cpe:/a:redhat:build_keycloak:26.2::el9"]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.4","defaultStatus":"affected","cpes":["cpe:/a:redhat:build_keycloak:26.4::el9"]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.2.16","defaultStatus":"affected","cpes":["cpe:/a:redhat:build_keycloak:26.2::el9"]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.4.12","defaultStatus":"affected","cpes":["cpe:/a:redhat:build_keycloak:26.4::el9"]}]
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Initial Analysis by NIST6/03/2026 3:51:26 PM
Action
Type
Old Value
New Value
Added
CPE Configuration
OR
*cpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:* versions from (including) 26.4 up to (excluding) 26.4.12
Added
Reference Type
Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:19594 Types: Vendor Advisory
Added
Reference Type
Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:19595 Types: Vendor Advisory
Added
Reference Type
Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:19596 Types: Vendor Advisory
Added
Reference Type
Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:19597 Types: Vendor Advisory
Added
Reference Type
Red Hat, Inc.: https://access.redhat.com/security/cve/CVE-2026-7507 Types: Vendor Advisory
Added
Reference Type
Red Hat, Inc.: https://bugzilla.redhat.com/show_bug.cgi?id=2464145 Types: Vendor Advisory
CVE Modified by Red Hat, Inc.5/20/2026 1:16:28 PM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:19595
Added
Reference
https://access.redhat.com/errata/RHSA-2026:19596
CVE Modified by Red Hat, Inc.5/20/2026 8:16:22 AM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:19594
Added
Reference
https://access.redhat.com/errata/RHSA-2026:19597
New CVE Received from Red Hat, Inc.5/19/2026 8:16:19 AM
Action
Type
Old Value
New Value
Added
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.
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