Keycloak is a widely used IAM solution; flaw allows issuance of JWTs for disabled accounts, enabling unauthorized access across many organizations.
CVE-2026-1609
Keycloak JWT grant bypass lets attackers obtain tokens for disabled users.
Is CVE-2026-1609 being exploited?
Not confirmed. CVE-2026-1609 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 0.56% probability of exploitation in the next 30 days.
How severe is CVE-2026-1609?
CVE-2026-1609 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-2026-1609?
Yes. A fix has been recorded for CVE-2026-1609. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-1609 affect?
CVE-2026-1609 affects Keycloak (JWT authorization grant preview enabled). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-1609?
Disable JWT authorization grant preview immediately; apply vendor patch when available.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
An attacker can present an external assertion to obtain a JWT for a disabled user, gaining unauthorized access to protected resources.
Immediate action required
- affected>= 26.5.0 and < 26.5.3
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.