CVE-2026-12894: Io.quarkus:quarkus-qute: quarkus-qute:server-side template injection (ssti) vulnerability in reflectionvalueresolver of the quarkus qute template engine

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-31 · updated 2026-10-20
Weakness: CWE-1336

Description

A flaw was found in the Qute template engine, which is used by Quarkus to generate dynamic content like HTML pages or emails. The issue exists in the component responsible for looking up data values (ReflectionValueResolver), which fails to properly block access to sensitive Java internal functions when processing certain data types like Enums. An attacker who can provide or influence the template text can exploit this bypass to take control of the server by executing unauthorized commands.

Affected products

quarkus-qute: from 3.27.0 before 3.27.5.SP1; from 3.33.0 before 3.33.3.SP1 — fixed in 3.27.5.SP1, 3.33.3.SP1
Red Hat Build of Apache Camel 3.33.3.SP1: all versions — fixed in 3.33.3.redhat-00005
Red Hat build of Apache Camel 4 for Quarkus 3: all versions
Red Hat build of Quarkus 3.27.5.SP1: all versions — fixed in 3.27.5.redhat-00004
Red Hat build of Quarkus 3.33.3.SP1: all versions — fixed in 3.33.3.redhat-00005

How to fix

Upgrade to a fixed version: quarkus-qute 3.27.5.SP1, 3.33.3.SP1; Red Hat Build of Apache Camel 3.33.3.SP1 3.33.3.redhat-00005; Red Hat build of Quarkus 3.27.5.SP1 3.27.5.redhat-00004; Red Hat build of Quarkus 3.33.3.SP1 3.33.3.redhat-00005. Check the vendor advisory for mitigations.

References

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