Improper access control in Quarkus - CVE-2026-19625
Published: September 2, 2026
Vulnerability identifier: #VU146776
CSH Severity: High
CVSS v4: 9.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-19625
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass authentication and gain unauthorized access to resources protected by a different OIDC tenant.
The vulnerability exists due to improper access control in the shared token-introspection cache in quarkus-oidc when handling binary access tokens across multiple OIDC provider tenants. A remote attacker can reuse a valid token for one tenant to access an endpoint secured by another tenant to bypass authentication and gain unauthorized access to resources protected by a different OIDC tenant.
The issue occurs only when a token introspection result cache is enabled and multiple endpoints are secured by individual OIDC provider tenants.
Affected software
Quarkus
How to mitigate CVE-2026-19625
Install security update from vendor's website.
Quarkus - addressed in versions 3.27.6, 3.33.4, 3.39.2, 3.40.0, 4.0.0