Blocksy Companion <= 2.1.46 - Unauthenticated Arbitrary File Upload via 'blc-review-images[]' Parameter
The Blocksy Companion plugin for WordPress is vulnerable to arbitrary file upload in all versions up to and including 2.1.46 via the save_attachments function. This issue occurs because the Custom Fonts extension registers a wp_check_filetype_and_ext filter that checks whether filenames contain .woff2 or .ttf using strpos() rather than verifying the final extension via PATHINFO_EXTENSION. Consequently, double-extension filenames such as shell.woff2.php pass MIME validation and are handled as permitted font files. This flaw allows unauthenticated remote attackers to upload executable files, potentially leading to remote code execution.
This vulnerability is exploitable only when the premium version (blocksy-companion-pro) is installed with both the WooCommerce Extra (Advanced Reviews) and Custom Fonts extensions active; the free blocksy-companion plugin does not contain the vulnerable code paths. CVE-2026-58480 is a duplicate of this vulnerability identifier.
What to do
Update Blocksy Companion to version 2.1.47 or later.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| WordPress plugin | Blocksy Companion | <= 2.1.46 | 2.1.47 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-434- Platform
- WordPress
- Package
Blocksy Companion- Disclosed
- 01.07.2026
- Updated
- 12.10.2026 17:19
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Vulnerability history: Blocksy Companion
All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 15
- First → latest
- 03.2022 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 2
- High 1
- Medium 12
Disclosures per year
- 2022: 1
- 2023: 2
- 2024: 4
- 2025: 3
- 2026: 5
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Blocksy Companion <= 2.1.46 - Unauthenticated Arbitrary File Upload via 'blc-review-images[]' Parameter this entry
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