CVE-2026-7507
A session fixation vulnerability was found in Keycloak's login-actions endpoints.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.57%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 0.57% probability · 45th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-290
- Affected
- redhat/build of keycloak
- Source
- secalert@redhat.com
References
- https://access.redhat.com/errata/RHSA-2026:19594Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:19595Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:19596Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:19597Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-7507Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2464145Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:19594Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:19595Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:19596Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:19597Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-7507Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2464145Vendor Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-7507.json
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.