CVE-2026-8378 Frontend File Manager Plugin <= 23.6 - Subscriber+ Stored Cross-Site Scripting via File Rename
Subscribers can inject malicious scripts via file names, allowing attackers to hijack administrator sessions when viewing the file manager.
- 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-2026-8378?
CVE-2026-8378 is a medium-severity cross-site scripting vulnerability in Unknown Frontend File Manager Plugin, published on 23 Jun 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
The Frontend File Manager Plugin WordPress plugin through 23.6 does not sanitise nor escape a filename submitted to the frontend file-rename endpoint before storing it as post meta and rendering it back on the admin File Manager listing, leading to a Stored Cross-Site Scripting vulnerability exploitable by users with Subscriber-level access and above against an administrator viewing the file management interface.
Which versions are affected by CVE-2026-8378?
How do I fix CVE-2026-8378?
No fix has been published for CVE-2026-8378 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-2026-8378 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-8378 exists.
Sources
Also known as GHSA-v62r-5pwf-6945.