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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.

PUBLISHED Reserved 2025-10-24 | Published 2025-12-05 | Updated 2025-12-05 | Assigner Wordfence




HIGH: 8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem types

CWE-434 Unrestricted Upload of File with Dangerous Type

Product status

Default status
unaffected

* (semver)
affected

Timeline

2025-12-04:Disclosed

Credits

Kenneth Dunn finder

References

www.wordfence.com/...-bf17-4e94-88cc-ad385b1fe97d?source=cve

wordpress.org/plugins/auto-thumbnailer/

cve.org (CVE-2025-12154)

nvd.nist.gov (CVE-2025-12154)