CVE-2026-109392 Pimcore through 2026.3.1 Stored XSS via ExternalImage Field Version Preview
Authenticated users can inject scripts via ExternalImage fields, executing JavaScript in admin views when others preview versions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-109392?
CVE-2026-109392 is a medium-severity cross-site scripting vulnerability in Pimcore, published on 12 Oct 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-109392?
How do I fix CVE-2026-109392?
No fix has been published for CVE-2026-109392 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-109392 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-109392 exists.
Sources
Also known as GHSA-w844-4xmf-w7mw.