Keycloak

26.6.4Security

2026年6月27日リンクをコピー

Keycloak 26.6.4 is a security release fixing eight CVEs, including two critical issues (privilege escalation and JWT authentication bypass) and four high-severity authorization bypasses. Operators should upgrade promptly; the release also bumps Quarkus to 3.33.2.1.

• securityTwo critical vulnerabilities: group-admin escalation and JWT auth bypass

  CVE-2026-9099 lets a group admin escalate to realm-admin, and CVE-2026-11800 allows authentication bypass via JWT algorithm confusion. Both are rated critical. Upgrade to 26.6.4 as soon as possible.

• securityFour high-severity authorization and access-control bypasses

  CVE-2026-9705 (client takeover via registration access token), CVE-2026-9795 (privilege escalation via scope mapping), CVE-2026-9799 (UMA permission ticket bypass), and CVE-2026-9800 (policy enforcer authorization bypass via incorrect URI comparison) are all rated high. If you use UMA authorization, fine-grained scope mappings, or the Policy Enforcer, prioritize this upgrade.

• securityTwo medium-severity issues: info disclosure and XSS

  CVE-2026-9083 (filesystem path probing) and CVE-2026-9086 (XSS via case-insensitive URI validation bypass) are rated medium and round out the fix set.