Vulnerability · Published Oct 12, 2026 · Assigned by VulnCheck
CVE-2026-109392Pimcore through 2026.3.1 Stored XSS via ExternalImage Field Version Preview
Medium 5.4
In plain English
A medium-severity cross-site scripting in Pimcore from Pimcore. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).
Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.2%top 93.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
References
- Researcher Disclosure technical-description, exploit
- https://github.com/pimcore/pimcore/blob/v2026.3.1/models/DataObject/ClassDefinition/Data/ExternalImage.php#L169-L203 technical-description
- https://github.com/pimcore/admin-ui-classic-bundle/blob/2.3/templates/admin/data_object/data_object/preview_version.html.twig#L198 technical-description
- https://github.com/pimcore/pimcore product
- VulnCheck Advisory: Pimcore through 2026.3.1 Stored XSS via ExternalImage Field Version Preview third-party-advisory