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Blocksy Companion Pro EUVDEUVD-2026-42233

| CVE-2026-58480 CRITICAL
Unrestricted Upload of File with Dangerous Type (CWE-434)
2026-07-08 VulnCheck GHSA-r58f-77hp-phcj
WordPress PHP RCE File Upload Blocksy Companion
9.2
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
9.2 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
8.1 HIGH

Unauthenticated network file-upload RCE (AV:N/PR:N/UI:N) with full CIA impact, but AC:H reflects the required PHP-execution-in-uploads server condition (AT:P in 4.0).

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Jul 08, 2026 - 13:50 vuln.today
CVE Published
Jul 08, 2026 - 13:05 cve.org
CRITICAL 9.2

DescriptionCVE.org

Blocksy Companion Pro plugin for WordPress before 2.1.47 contains an unauthenticated arbitrary file upload vulnerability that allows attackers to upload executable files by bypassing extension validation in the save_attachments function exposed through the Advanced Reviews feature. Attackers can exploit the Custom Fonts extension's flawed strpos() substring check by uploading double-extension filenames such as shell.woff2.php, causing the validation to pass on the substring match while the web server executes the file as PHP, achieving remote code execution.

Articles & Coverage 2

News 5 New PHP Vulnerabilities - 3 Critical, 2 High, 1 With POC Jul 09, 2026 News Critical RCE in WordPress Blocksy Companion Pro Plugin - CVE-2026-58480 Jul 09, 2026

AnalysisAI

Remote code execution in the Blocksy Companion Pro WordPress plugin (all versions before 2.1.47) lets unauthenticated attackers upload executable PHP files through the Advanced Reviews feature, taking over the site. The save_attachments function relies on a flawed strpos() substring check inherited from the Custom Fonts extension, so a double-extension filename like shell.woff2.php passes validation while the server executes it as PHP. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Reach review-image upload endpoint
Delivery
POST file named shell.woff2.php
Exploit
strpos() substring check passes
Install
File stored in uploads dir
C2
Request uploaded file URL
Execute
Web server executes PHP
Impact
Remote code execution and site takeover
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Vulnerability AssessmentAI

Exploitation Exploitation requires the target to be running Blocksy Companion Pro before 2.1.47 with the Advanced Reviews feature exposed (the save_attachments upload path reachable via the blc-review-images parameter), and - reflected in the CVSS AT:P flag - the web server must be configured to execute PHP files from the plugin's upload/attachments directory, which is the default on most WordPress/LAMP deployments but can be disabled. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine high-priority issue rather than a high-score-low-risk case. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker sends an unauthenticated HTTP POST to the plugin's review-image upload endpoint carrying a file named shell.woff2.php whose body contains PHP code; the strpos() check sees 'woff2' and accepts it. The attacker then requests the stored file's URL, the web server executes the embedded PHP, and the attacker gains remote code execution and full control of the WordPress site. …
Remediation Vendor-released patch: upgrade Blocksy Companion (Pro) to version 2.1.47 or later, available via https://wordpress.org/plugins/blocksy-companion/ and the vendor/VulnCheck advisory. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Inventory all WordPress installations running Blocksy Companion Pro and document current plugin versions. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-42233 vulnerability details – vuln.today
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