Description
Blocksy Companion Pro plugin for WordPress before 2.1.47 contains an unauthenticated arbitrary file upload vulnerability that allows attackers to upload executable files by bypassing extension validation in the save_attachments function exposed through the Advanced Reviews feature. Attackers can exploit the Custom Fonts extension's flawed strpos() substring check by uploading double-extension filenames such as shell.woff2.php, causing the validation to pass on the substring match while the web server executes the file as PHP, achieving remote code execution.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Creative Themes | Blocksy Companion | ≤ 2.1.46 | 2.1.47 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Exploit-DB 1
- Blocksy Companion 2.1.46 - RCE EDB-52640 · webapps · Aug 11, 2026
GitHub 1 repository
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shinthink/CVE-2026-58480 ★ 2 · Jul 26, 2026
CVE-2026-58480 / CVE-2026-15158 — Unauthenticated RCE in Blocksy Companion Pro < 2.1.47 (300K+ installs). Pre-auth arbitrary file upload via double-extension bypass.
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- Wordfence Advisory third-party-advisory
- Patchstack Advisory third-party-advisory
- WordPress Plugin Page product patch
- https://www.vulncheck.com/advisories/blocksy-companion-pro-unauthenticated-file-upload-via-save-attachments third-party-advisory