← Vulnerability feed

Vulnerability record · CVE-2026-15158 · published 9 July 2026

CVE-2026-15158: Unrestricted file upload vulnerability

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.

9.8 CVSS 3.1 Critical EPSS 1.1% · top 36.6% CWE-434 · Unrestricted file upload Deferred
9.8CVSS 3.1 base score
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
9 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.46/framework/premium/extensions/custom-fonts/exten
https://plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.46/framework/premium/extensions/woocommerce-extra/
https://www.wordfence.com/threat-intel/vulnerabilities/id/2df449b4-3f3b-4afc-b391-8d8d11710c07?source=cve

Track CVE-2026-15158 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2026-56291Balbooa Forms Joomla extension unauthenticated arbitrary file upload RCEThe Balbooa Forms extension for Joomla before version 2.4.1 accepts file uploads without authentication and does not restrict file type, allowing exe…KEVEPSS 15%analysed10.0CVE-2026-48939iCagenda Joomla extension unrestricted file upload leads to PHP RCEThe iCagenda extension for Joomla fails to restrict file types in its file attachment feature, allowing arbitrary file uploads that result in PHP cod…KEVEPSS 20%analysed10.0CVE-2026-56290Joomla Page Builder CK unauthenticated file upload leads to RCEThe Joomla Page Builder CK extension before 3.6.0 allows unauthenticated arbitrary file uploads, letting an attacker place executable files on the se…KEVEPSS 31%analysed10.0CVE-2026-48908SP Page Builder for Joomla unauthenticated arbitrary file upload RCESP Page Builder for Joomla permits unauthenticated users to upload arbitrary files, which can lead to upload and execution of PHP code. The flaw is a…KEVEPSS 89%analysed9.8CVE-2024-7399Samsung MagicINFO 9 Server path traversal allows arbitrary file writeSamsung MagicINFO 9 Server before version 21.1050 contains a path traversal flaw (CWE-22) that also enables unrestricted file upload (CWE-434), letti…KEVEPSS 92%analysed7.2CVE-2025-2749Kentico Xperience path traversal and file upload lead to RCEKentico Xperience through 13.0.178 allows an authenticated Staging Sync Server user to upload arbitrary data to relative paths, enabling path travers…KEVEPSS 4.1%analysed7.2CVE-2024-7694ThreatSonar Anti-Ransomware unrestricted file upload enables command executionThreatSonar Anti-Ransomware from TeamT5 fails to properly validate the content of uploaded files (CWE-434). An attacker holding administrator privile…KEVEPSS 1.8%analysed10.0CVE-2025-52691SmarterMail unauthenticated arbitrary file upload leading to RCESmarterTools SmarterMail contains an unrestricted file upload flaw (CWE-434) that lets an unauthenticated attacker write files to any location on the…KEVEPSS 86%analysed

Source: NIST National Vulnerability Database (record CVE-2026-15158), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.