CVE-2026-109392

medium

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.

References

https://www.vulncheck.com/advisories/pimcore-through-2026.3.1-stored-xss-via-externalimage-field-version-preview

https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/rJCbgCKjMe

https://github.com/pimcore/pimcore/blob/v2026.3.1/models/DataObject/ClassDefinition/Data/ExternalImage.php#L169-L203

https://github.com/pimcore/pimcore

https://github.com/pimcore/admin-ui-classic-bundle/blob/2.3/templates/admin/data_object/data_object/preview_version.html.twig#L198

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-97490

Details

Source: Mitre, NVD

Published: 2026-10-12

Updated: 2026-10-13

Risk Information

CVSS v2

Base Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 5.4

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

Severity: Medium

CVSS v4

Base Score: 5.1

Vector: 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

Severity: Medium

EPSS

EPSS: 0.00171