Keycloak is widely used for identity/authorization; an authz bypass enabling access to admin/restricted areas can impact many organizations.
CVE-2026-15573
Keycloak Authorization Services URI normalization flaw lets authenticated users bypass policies.
Is CVE-2026-15573 being exploited?
Not confirmed. CVE-2026-15573 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.32% probability of exploitation in the next 30 days.
How severe is CVE-2026-15573?
CVE-2026-15573 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-15573?
Yes. A fix has been recorded for CVE-2026-15573. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-15573 affect?
CVE-2026-15573 affects Keycloak Authorization Services, Keycloak (PathMatcher component). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-15573?
Apply vendor patch when available; normalize/validate URIs, restrict and audit admin endpoints.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated users can bypass authorization and access administrative or restricted endpoints via crafted URLs (trailing slashes/matrix params).
Immediate action required