EUVD-2026-42549
GHSA-hhjp-58g7-3jr8
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated remote file upload yields code execution with full C/I/A impact; the pro/extension requirement is a deployment precondition, not attack complexity, so AC:L and PR:N stand.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
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.
Articles & Coverage 1
AnalysisAI
Arbitrary file upload leading to remote code execution affects the premium Blocksy Companion Pro plugin for WordPress in all versions through 2.1.46, where the Custom Fonts extension's flawed MIME validation lets unauthenticated attackers upload executable PHP files disguised as fonts. The Custom Fonts extension registers a wp_check_filetype_and_ext filter that uses strpos() to approve any filename merely containing '.woff2' or '.ttf' anywhere in the string, so a double-extension payload like shell.woff2.php passes as a legitimate font. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the premium blocksy-companion-pro plugin to be installed AND both the WooCommerce Extra (Advanced Reviews) extension and the Custom Fonts extension to be active simultaneously - the free blocksy-companion plugin is not affected. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H = 9.8) describes remote, unauthenticated, low-complexity exploitation with full confidentiality, integrity, and availability impact - consistent with unauthenticated RCE via arbitrary file upload. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker locates a WordPress site running Blocksy Companion Pro with the Advanced Reviews and Custom Fonts extensions active, then submits a product review attachment named shell.woff2.php containing PHP code. The save_attachments handler passes the file through the Custom Fonts filter, whose strpos() substring check sees '.woff2' and approves it, writing the file to the server; the attacker then requests the uploaded .php file to execute arbitrary code. … |
| Remediation | No vendor-released patched version was identified in the provided data, so no exact fix version can be cited; monitor the Wordfence advisory (https://www.wordfence.com/threat-intel/vulnerabilities/id/2df449b4-3f3b-4afc-b391-8d8d11710c07?source=cve) and the Creative Themes HQ changelog for a release above 2.1.46 and upgrade immediately once available. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
24 hours: Inventory all WordPress installations using Blocksy Companion Pro; immediately disable the Custom Fonts extension or deactivate the entire plugin if not operationally critical. …
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