CVE-2025-12154 Auto Thumbnailer <= 1.0 - Authenticated (Contributor+) Arbitrary File Upload
Authenticated contributors can upload arbitrary files via missing validation, potentially leading to remote code execution on WordPress sites.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-12154?
CVE-2025-12154 is a high-severity vulnerability in moderntribe Auto Thumbnailer, published on 5 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Auto Thumbnailer plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the uploadThumb() function in all versions up to, and including, 1.0. This makes it possible for authenticated attackers, with Contributor-level access and above, to upload arbitrary files on the affected site's server which may make remote code execution possible.
Weakness: CWE-434
Which versions are affected by CVE-2025-12154?
How do I fix CVE-2025-12154?
No fix has been published for CVE-2025-12154 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-12154 being exploited?
There is no known exploitation of CVE-2025-12154 in the wild and no public exploit code.
Sources
Also known as GHSA-mp5q-9g62-4fc6.