Blocksy Companion <= 2.1.46 - Unauthenticated Arbitrary File Upload via 'blc-review-images[]' Parameter
| CVE | CVE-2026-15158 |
|---|---|
| CVSS | 9.8 (Critical) |
| Publicly Published | July 1, 2026 |
| Last Updated | July 9, 2026 |
| Researcher |
Nguyen Ba Khanh
|
Description
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 is due to the Custom Fonts extension registering a wp_check_filetype_and_ext filter that approves any filename containing .woff2 or .ttf as a substring via strpos() rather than validating that those strings appear as the final extension via PATHINFO_EXTENSION — allowing double-extension filenames such as shell.woff2.php to pass MIME validation and be handled as permitted font files. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. This vulnerability is only exploitable when the premium version of the plugin (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 CVE.
Learn more about Arbitrary File Upload vulnerabilities and how to prevent them.
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Vulnerability Details for Blocksy Companion
| Software Type | Plugin |
|---|---|
| Software Slug | blocksy-companion (view on wordpress.org) |
| Patched? | Yes |
| Remediation | Update to version 2.1.47, or a newer patched version |
| Affected Version |
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| Patched Version |
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Recent vulnerabilities in Blocksy Companion
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