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CVE-2026-15158— Blocksy Companion <= 2.1.46 - Unauthenticated Arbitrary File Upload via 'blc-review-images[]' Parameter

Quick assessment

Affected
creativethemeshq Blocksy Companion
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Creative Themes Blocksy Companion是Creative Themes公司的一个WordPress插件。 WordPress Blocksy Companion 2.1.46及之前版本存在任意文件上传漏洞，该漏洞源于save_attachments函数中的任意文件上传问题，Custom Fonts扩展注册的wp_check_filetype_and_ext过滤器使用strpos()而非PATHINFO_EXTENSION验证文件扩展名，导致双扩展名文件如shell.woff2.

CVSS 9.8 · Critical EPSS 0.61% · P46

Possible ATT&CK Techniques 1 AI

T1505.003 · Web Shell

Affected Version Matrix 1

VendorProduct Version RangeStatus
creativethemeshq Blocksy Companion ≤ 2.1.46 affected
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I. Basic Information for CVE-2026-15158

Vulnerability Information
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Vulnerability Title
Blocksy Companion <= 2.1.46 - Unauthenticated Arbitrary File Upload via 'blc-review-images[]' Parameter
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress Blocksy Companion 任意文件上传漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Creative Themes Blocksy Companion是Creative Themes公司的一个WordPress插件。 WordPress Blocksy Companion 2.1.46及之前版本存在任意文件上传漏洞，该漏洞源于save_attachments函数中的任意文件上传问题，Custom Fonts扩展注册的wp_check_filetype_and_ext过滤器使用strpos()而非PATHINFO_EXTENSION验证文件扩展名，导致双扩展名文件如shell.woff2.
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
creativethemeshq Blocksy Companion 0 ~ 2.1.46 -

II. Public POCs for CVE-2026-15158

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III. Intelligence Information for CVE-2026-15158

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Patches & Fixes for CVE-2026-15158 (1)

Vendor Advisories for CVE-2026-15158 (1)

IV. Related Vulnerabilities

Same product: Blocksy Companion
Same vendor: creativethemeshq
Same weakness: CWE-434

V. Comments for CVE-2026-15158

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