Improper access control in Quarkus - CVE-2026-12894
Published: September 2, 2026
Vulnerability identifier: #VU146774
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-12894
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to improper access control in the ReflectionValueResolver component of the Quarkus Qute template engine when rendering attacker-controlled templates. A remote user can bypass the security filter and construct a reflection chain to execute arbitrary code.
Exploitation requires access to template input and the presence of an Enum instance in the template context.
Affected software
Quarkus
How to mitigate CVE-2026-12894
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