PT-2025-49203 · WordPress · Auto Thumbnailer

Kenneth Dunn · Published 2025-12-05 · Updated 2025-12-10 · CVE-2025-12154

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Auto Thumbnailer WordPress plugin versions prior to 1.0.

Description The Auto Thumbnailer plugin for WordPress is susceptible to arbitrary file uploads because of a lack of file type validation within the uploadThumb() function. This allows authenticated attackers with Contributor-level access or higher to upload arbitrary files to the server, potentially leading to remote code execution.

Recommendations Update Auto Thumbnailer WordPress plugin to a version newer than 1.0.

Fix

Unrestricted File Upload

Weakness Enumeration

CWE-434

Related Identifiers

CVE-2025-12154

Affected Products

Auto Thumbnailer

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2025-12154 · Security Note
• https://wordfence.com/threat-intel/vulnerabilities/id/d7c98191-bf17-4e94-88cc-ad385b1fe97d?source=cve · Note
• https://wordpress.org/plugins/auto-thumbnailer · Note
• https://twitter.com/cracbot/status/1998709322008899629 · Twitter Post
• https://twitter.com/CveFindCom/status/1996831704451830253 · Twitter Post
• https://twitter.com/CVEnew/status/1996841698622931336 · Twitter Post
• https://twitter.com/RedPacketSec/status/1996890983724659184 · Twitter Post