CVE-2026-109392
Pimcore through 2026.3.1 Stored XSS via ExternalImage Field Version Preview
- State
- Published
- Severity
- 5.1 Medium
- Published
- Oct 12, 2026
- Updated
- Oct 13, 2026
- Reserved
- Oct 12, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.1 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N | VulnCheck |
| 3.1 | 5.4 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
PimcorePimcore |
|
References
- Researcher Disclosuretechnical-descriptionexploit
- https://github.com/pimcore/pimcore/blob/v2026.3.1/models/DataObject/ClassDefinition/Data/ExternalImage.php#L169-L203technical-description
- https://github.com/pimcore/admin-ui-classic-bundle/blob/2.3/templates/admin/data_object/data_object/preview_version.html.twig#L198technical-description
- https://github.com/pimcore/pimcoreproduct
- VulnCheck Advisory: Pimcore through 2026.3.1 Stored XSS via ExternalImage Field Version Previewthird-party-advisory
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