CVE-2026-1609: A flaw was found in Keycloak. When the JSON Web Token (JWT) authorization grant preview feature is enabled and a user account is disabled, Keycloak fails to validate the user’s dis

highCVSS 8.1CVE-2026-1609

A flaw was found in Keycloak. When the JSON Web Token (JWT) authorization grant preview feature is enabled and a user account is disabled, Keycloak fails to validate the user’s disabled status during JWT authorization grant processing. A remote attacker with low privileges can exploit this improper access control vulnerability by presenting a valid assertion token from an external identity provider to obtain a JWT for a disabled user. This allows unauthorized access to sensitive resources.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: high — CVSS 8.1
Published: 2026-07-16
Last updated: 2026-07-16
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-1609

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-16090.51% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 40% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-1609	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[UPDATE] [high] Keycloak: Multiple vulnerabilitiescert-bund

Recent advisories for Keycloak. When the

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

mediumCVE-2026-18573: A flaw was found in the keycloak-services component of Keycloak, which is used for managing au…nvd · 2026-08-02
mediumCVE-2026-18572: Keycloak provides authorization services that allow administrators to restrict access to resou…nvd · 2026-08-02
mediumCVE-2026-18571: A flaw was found in the user creation component of Keycloak when Fine-Grained Admin Permission…nvd · 2026-08-02
mediumCVE-2026-18570: A flaw was found in the full-scope-disabled client-policy executor within the keycloak-service…nvd · 2026-08-02
mediumCVE-2026-18218: A flaw was found in the TokenManager component of the Keycloak identity management service. Wh…nvd · 2026-07-31
lowCVE-2026-18217: A flaw was found in the SAML protocol implementation of Keycloak, an open-source identity and …nvd · 2026-07-31