Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Pimcore | Pimcore | ≤ 2026.3.1 | — |
References
- Researcher Disclosure technical-description exploit
- https://github.com/pimcore/pimcore/blob/v2026.3.1/models/DataObject/ClassDefinition/Data/ExternalImage.php#L169-L203 technical-description
- https://github.com/pimcore/admin-ui-classic-bundle/blob/2.3/templates/admin/data_object/data_object/preview_version.html.twig#L198 technical-description
- https://github.com/pimcore/pimcore product
- VulnCheck Advisory: Pimcore through 2026.3.1 Stored XSS via ExternalImage Field Version Preview third-party-advisory