CVE-2026-58480
Blocksy Companion Pro < 2.1.47 Unauthenticated File Upload via save_attachments
- State
- Published
- Severity
- 9.2 Critical
- Published
- Jul 8, 2026
- Updated
- Jul 14, 2026
- Reserved
- Jun 30, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.2 Critical | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-434 Unrestricted Upload of File with Dangerous Type
Affected Products
| Product | Versions |
|---|---|
Blocksy CompanionCreative Themes |
|
References
- Wordfence Advisorythird-party-advisory
- Patchstack Advisorythird-party-advisory
- WordPress Plugin Pageproductpatch
- https://www.vulncheck.com/advisories/blocksy-companion-pro-unauthenticated-file-upload-via-save-attachmentsthird-party-advisory
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