CVE-2026-109392
Pimcore through 2026.3.1 Stored XSS via ExternalImage Field Version Preview
Pimcore Pimcore
CVSS
5.1MediumExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 13 Oct 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.17%Chance of exploitation activity in the next 30 days, higher than 6% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
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.
Text from CVE List
Affected versions 1
- Pimcoreaffected: all versions through 2026.3.1CVE List
References 5
- vulncheck.com/advisories/pimcore-through-2026.3.1-stored-xss-via-externalimage-field-version-previewAdvisoryvia CVE List
- hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/rJCbgCKjMeExploitvia CVE List
- github.com/pimcore/pimcore/blob/v2026.3.1/models/DataObject/ClassDefinition/Data/ExternalImage.php#L169-L203Referencevia CVE List
- github.com/pimcore/admin-ui-classic-bundle/blob/2.3/templates/admin/data_object/data_object/preview_version.html.twig#L198Referencevia CVE List
- github.com/pimcore/pimcoreReferencevia CVE List