CVE-2026-109392

MEDIUM 5.4

Pimcore through 2026.3.1 Stored XSS via ExternalImage Field Version Preview

CVSS Score

5.4

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	pimcore
Product	pimcore
Published	Oct 12, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

Pimcore / Pimcore

0 ≤ 2026.3.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

hackmd.io: https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/rJCbgCKjMe github.com: https://github.com/pimcore/pimcore/blob/v2026.3.1/models/DataObject/ClassDefinition/Data/ExternalImage.php#L169-L203 github.com: https://github.com/pimcore/admin-ui-classic-bundle/blob/2.3/templates/admin/data_object/data_object/preview_version.html.twig#L198 github.com: https://github.com/pimcore/pimcore vulncheck.com: https://www.vulncheck.com/advisories/pimcore-through-2026.3.1-stored-xss-via-externalimage-field-version-preview

Credits

hieuPenguinnn