Vulnerability · Published Jul 8, 2026 · Assigned by VulnCheck
CVE-2026-58480Blocksy Companion Pro < 2.1.47 Unauthenticated File Upload via save_attachments
Critical 9.8
In plain English
A critical-severity unrestricted file upload in Blocksy Companion from Creative Themes. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 3.6% (higher than 89% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Creative Themes | Blocksy Companion | 0 – through 2.1.46 |
Weakness: CWE-434 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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