Is Auto Thumbnailer safe to use?

Laskyr does not give safety verdicts. Auto Thumbnailer is closed on wordpress.org. Closed on 2025-12-03 (reason given: Security Issue). Closed plugins get no updates through WordPress, so new security holes will not be fixed for you. Keep Auto Thumbnailer on the latest version and remove it if you do not use it.

Which versions of Auto Thumbnailer are vulnerable?

Known issues on record (newest first): Arbitrary file upload (1.0 and older). The full list with sources is on this page.

What should I do if my Auto Thumbnailer is out of date?

Take a backup, then update it from Dashboard > Updates (or run wp plugin update auto-thumbnailer). If you cannot update right away, deactivate it until you can. If you think the site was already attacked, run a free scan at https://laskyr.com/scan.

Plugins · auto-thumbnailer · data as of 2026-11-04

Is Auto Thumbnailer safe? Known vulnerabilities and latest version

Status: Closed 2025-12-03
Known issues on record: 1
Unpatched in latest: 0

What to do

Replace it. A closed plugin gets no updates through WordPress, so any hole found from now on stays open.
Deactivate and delete it once you have a replacement (Plugins → Deactivate → Delete). Deleting removes its files; deactivating alone leaves them on the server.
If you ran a vulnerable version and something looks off (spam pages, strange admins, redirects), run the free scan, or have us clean it: Emergency Cleanup, $499.

With WP-CLI, once you have a replacement: wp plugin deactivate auto-thumbnailer && wp plugin delete auto-thumbnailer

Check your version

Known vulnerabilities

1 on record, newest first. “Affected” is the version range the source gives; “fixed in” is the version the source names, or (marked *) the first wordpress.org release after the last affected version. 1 record(s) do not state which versions are affected.

high 8.8 CVE-2025-12154 · published 2025-12-05

Arbitrary file upload in Auto Thumbnailer (1.0 and older)

Affected: 1.0 and older
Fixed in: unknown
Access needed (per CVSS): Needs a low-level account (e.g. subscriber)
Range from: CVE record (the advisory publisher) · score by Wordfence

Details from the advisory

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.

NVD CVE-2025-12154 Wordfence advisory wordpress.org

Recent activity

2025-12-03 — closed on wordpress.org (Security Issue).
2025-12-05 — Arbitrary file upload disclosed (CVE-2025-12154), fix version not stated.

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Browse vulnerabilities

Types found in this plugin: Arbitrary file upload (1)

Where this data comes from

Version, last update, installs, closure: wordpress.org/plugins/auto-thumbnailer (Plugins API), fetched 2026-11-04.
Vulnerabilities: NIST National Vulnerability Database (NVD), checked 2026-11-04. This product uses data from the NVD API but is not endorsed or certified by the NVD.
Each record links to its CVE page and to the original advisory (Wordfence, Patchstack or WPScan) where there is one. We only list a CVE here when its references or its advisory name this exact plugin, so a few real issues may be missing; none should be about a different plugin. Spot an error? Email Daniel.

Badge for your site or docs (states facts with a date, not a verdict):

<a href="https://laskyr.com/plugins/auto-thumbnailer"><img src="https://laskyr.com/plugins/auto-thumbnailer/badge.svg" alt="Auto Thumbnailer vulnerability status"></a>

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