XSS in Pimcore
CVE-2026-109392
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/rJCbgCKjMe (technical-description, exploit)
- github.com/pimcore/pimcore/blob/v2026.3.1/models/DataObject/ClassDefinition/Dat… (technical-description)
- github.com/pimcore/admin-ui-classic-bundle/blob/2.3/templates/admin/data_object… (technical-description)
- github.com/pimcore/pimcore (product)
- www.vulncheck.com/advisories/pimcore-through-2026.3.1-stored-xss-via-externalim… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109392?
- CVE-2026-109392 is a medium-severity vulnerability in Pimcore, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-10-12.
- How severe is CVE-2026-109392?
- Medium severity. CVSS v3 base score is 5.4 out of 10.