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Mushr00w Uploader is a PHP web shell used to upload additional malicious files to compromised WordPress sites. It provides a browser-based file-upload interface and has been observed being deployed through exploitation of CVE-2026-14894, an unauthenticated arbitrary-file-upload vulnerability in the Super Forms WordPress plugin. Attackers submit the web shell as a Base64-encoded PHP payload disguised as image data, then use it as a first-stage foothold to deploy further payloads. The available evidence does not establish attribution to a specific threat actor.
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1 CVE Mallory has correlated with this family across public research and vendor advisories. Each row links to the full Mallory page for that vulnerability.
The uploaded file, while prefixed with the "data:image/gif;base64" content type, is a PHP file-uploader web shell ("Mushr00w_upl.php"), which then acts as a conduit to upload additional payloads to the site.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
PHP web shell and file uploader deployed through exploitation of the Super Forms arbitrary-file-upload flaw. It enables attackers to upload additional payloads and execute server-side actions on a compromised WordPress site.
A PHP file-uploader web shell deployed through exploitation of the Super Forms arbitrary file-upload flaw. It enables attackers to upload additional payloads to a compromised WordPress site.
A compact PHP upload webshell/dropper uploaded through the Super Forms arbitrary-file-upload flaw. It provides a browser-based file-upload interface that attackers can use to place additional shells, spam files, phishing kits, or other malicious code on a compromised site.
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