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Vulnerability record · CVE-2025-12154 · published 5 December 2025

CVE-2025-12154: Unrestricted file upload vulnerability

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.

8.8 CVSS 3.1 High EPSS 0.52% · top 58.2% CWE-434 · Unrestricted file upload Deferred
8.8CVSS 3.1 base score
0.52%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://wordpress.org/plugins/auto-thumbnailer/
https://www.wordfence.com/threat-intel/vulnerabilities/id/d7c98191-bf17-4e94-88cc-ad385b1fe97d?source=cve

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Source: NIST National Vulnerability Database (record CVE-2025-12154), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.