---
id: CVE-2026-109392
title: >-
  Pimcore through 2026.3.1 contains a stored cross-site scripting vulnerability
  that allows authenticated backend users to inject scripts by storing unescaped
  URLs in ExternalImage fields
summary: >-
  Pimcore through 2026.3.1 contains a stored cross-site scripting vulnerability
  that allows authenticated backend users to inject scripts by storing unescaped
  URLs in ExternalImage fields. Attackers with data object edit permission can
  sto…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
published: '2026-10-12'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T16:17:04.687'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109392'
references:
  - url: >-
      https://github.com/pimcore/admin-ui-classic-bundle/blob/2.3/templates/admin/data_object/data_object/preview_version.html.twig#L198
    label: disclosure@vulncheck.com
  - url: 'https://github.com/pimcore/pimcore'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/pimcore/pimcore/blob/v2026.3.1/models/DataObject/ClassDefinition/Data/ExternalImage.php#L169-L203
    label: disclosure@vulncheck.com
  - url: 'https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/rJCbgCKjMe'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/pimcore-through-2026.3.1-stored-xss-via-externalimage-field-version-preview
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-12T16:57:59.913Z'
---

## Overview

Pimcore through 2026.3.1 contains a stored cross-site scripting vulnerability that allows authenticated backend users to inject scripts by storing unescaped URLs in ExternalImage fields. Attackers with data object edit permission can store attribute-breaking payloads that execute JavaScript in the admin origin when other users open version preview or diff views.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.