Issued:
2026-06-25
Updated:
2026-06-25

RHSA-2026:30083 - Important: Red Hat build of Keycloak 26.6.4 Security Update

Synopsis

Important: Red Hat build of Keycloak 26.6.4 Security Update

Type/Severity

Security Advisory Important

Topic

New Red Hat build of Keycloak 26.6.4 packages are available from the Customer Portal

Description

Red Hat build of Keycloak 26.6.4 is a standalone server, based on the Keycloak project, that provides authentication and standards-based single sign-on capabilities for web and mobile applications.

Security fixes:

  • Information disclosure via CORS header injection due to unvalidated JWT azp claim (CVE-2026-37977)
  • Server-Side Request Forgery via OIDC token endpoint manipulation (CVE-2026-4874)
  • eclipse-vertx/vert.x: Denial of Service via TLS handshake with wildcard server name (CVE-2026-6860)
  • Improper Access Control on Keycloak Server when the account Account API feature is disabled (CVE-2026-7500)
  • Policy bypass during WebAuthn credential registration via client-side JavaScript manipulation (CVE-2026-8830)
  • Security flaw in org.keycloak/keycloak-services (CVE-2026-8922)
  • Information disclosure through arbitrary filesystem path probing (CVE-2026-9083)
  • Cross-site scripting (XSS) via case-insensitive URI validation bypass (CVE-2026-9086)
  • Cross-Session Email Verification Proof Not Bound to Upstream Identity in First-Broker-Login (CVE-2026-9087)
  • Information disclosure due to user profile permission bypass (CVE-2026-9088)
  • Group-Admin Escalation to Realm-Admin (CVE-2026-9099)
  • Privilege escalation due to oversized subject_token JWT (CVE-2026-9704)
  • Attacker can re-enable and take over disabled clients via Registration Access Token (CVE-2026-9705)
  • Organization Data Leak After Feature Disabled in Keycloak (CVE-2026-9791)
  • Security restriction bypass allows unauthorized ROPC token acquisition (CVE-2026-9792)
  • Information disclosure via SAML ECP endpoint (CVE-2026-9794)
  • Privilege escalation via improper scope mapping enforcement (CVE-2026-9795)
  • Unauthorized access to resources via UMA permission ticket bypass (CVE-2026-9799)
  • Authorization bypass via incorrect URI comparison (CVE-2026-9800)
  • Denial of Service via malformed LDAP password policy response (CVE-2026-9801)
  • Unauthorized account access via replayed refresh tokens after cluster restart (CVE-2026-9802)
  • Denial of Service via malformed Authorization header (CVE-2026-9803)

Solution

Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.

Affected Products

ProductVersionArch
Red Hat build of KeycloakText-only Advisoriesx86_64

Fixes

(none)

CVEs

References

Additional information