Unauthenticated account takeover in widely used Red Hat Build of Keycloak IAM; high-risk cross-organizational impact.
CVE-2026-18963
Unauthenticated attacker can reset any user's Keycloak password and take over accounts.
Is CVE-2026-18963 being exploited?
Not confirmed. CVE-2026-18963 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 3.2% probability of exploitation in the next 30 days.
How severe is CVE-2026-18963?
CVE-2026-18963 is rated Critical with a CVSS score of 9.1. 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-2026-18963?
Yes. A fix has been recorded for CVE-2026-18963. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-18963 affect?
CVE-2026-18963 affects Red Hat Build of Keycloak (keycloak-services component), Keycloak deployments using default reset flow. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-18963?
Apply vendor patch when available or disable reset flow; enforce MFA and require email verification.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Bypasses email verification to reset passwords, allowing full takeover of targeted Keycloak user accounts.
Immediate action required