Disclosure summary
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.
Source-reported weakness categories
CWE-290
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2026-7507
Open original source · Updated Oct 06, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
| Vendor | Product / association | Version / bounds |
|---|---|---|
| redhat | build_of_keycloak | * {"versionStartIncluding":"26.4","versionEndExcluding":"26.4.12"} |
Original records & references
- NIST NVD record
- CVE Program record
- access.redhat.com — Vendor Advisory
- access.redhat.com — Vendor Advisory
- access.redhat.com — Vendor Advisory
- access.redhat.com — Vendor Advisory
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com — Vendor Advisory
- bugzilla.redhat.com — Vendor Advisory
- access.redhat.com — Vendor Advisory
- access.redhat.com — Vendor Advisory
- access.redhat.com — Vendor Advisory
- access.redhat.com — Vendor Advisory
- access.redhat.com — Vendor Advisory
- bugzilla.redhat.com — Vendor Advisory
- security.access.redhat.com
PUBLISHED 2026-05-19T08:16:19-04:00
MODIFIED 2026-10-06T13:17:27-04:00
INGESTED 2026-10-10T20:25:11-04:00