Auto Thumbnailer: Dangerous file upload
Auto Thumbnailer is affected by dangerous file upload. Exploitation requires an authenticated contributor account. Successful exploitation can place attacker-controlled executable content on the server and may lead to full site compromise.
- Component
- Auto Thumbnailer
- Plugin slug
auto-thumbnailer- Affected
- See vendor advisory
- Safe version
- See mitigation notes
- Published
- Dec 05, 2025
This CVE was published Dec 05, 2025 and is one of 1 known issue for this plugin.
Update, patch or deactivate.
No fixed release is identified. Update Auto Thumbnailer when a confirmed fixed release becomes available; until then, disable and remove it when the site's risk warrants.
No confirmed safe version is listed. Consider a vendor-supported patch or temporarily restricting the affected functionality while you assess the risk.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical 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.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H