An authenticated administrative user who can import or save DataObject class definitions can inject attacker-controlled composite index metadata and trigger unintended SQL execution in the backend.

This issue affects pimcore: 12.3.3.

Affected: Packagist: pimcore/pimcore

My name is Oscar Uribe, Security Researcher at Fluid Attacks. I am reaching out because we have identified a security vulnerability in Pimcore 12.3.3 that we would like to report to you so we can coordinate a responsible disclosure together.

As part of our standard disclosure measures, we follow a timeline (outlined at https://fluidattacks.com/advisories/policy), which is aligned with ISO/IEC 29147:2018 and ISO/IEC 30111:2019. In short, the timeline works as follows: we ask for acknowledgment of the report within a few days of your first accessing it, and from there, we are happy to coordinate a joint disclosure date with you, typically within 90 days of the initial discovery. This gives your team reasonable time to assess, develop, and release a fix.

We have reserved the CVE ID **"CVE-2026-5394"** for this issue, and the advisory will eventually be published at [https://fluidattacks.com/advisories/dragons](https://fluidattacks.com/advisories/dragons). We are committed to coordinating the timing of that publication with you.

Please feel free to reach out if you have any questions about the report, the process, or the timeline. We are glad to work with you on this.

## Description An authenticated administrative user who can import or save DataObject class definitions can inject attacker-controlled composite index metadata and trigger unintended SQL execution in the backend.

The vulnerable flow accepts `compositeIndices` from imported JSON, stores the values without stric…