by Kastro
Paper/Archive/CVE-2026-58480

CVE-2026-58480

Creative Themes Blocksy Companion — Blocksy Companion Pro < 2.1.47 Unauthenticated File Upload via save_attachments

EPSS 4%CVSS 9.8
critical.is priorityof 100
47
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 89.4.894 × 2017.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Blocksy Companion≤ 2.1.462.1.47CNA

Scores by source

VulnCheck (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
VulnCheck (CNA)9.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

writeupwordfence.com/threat-intel/vulnerabilities/wordpress-plugins/blocksy-companion/blocksy-companion-2146-unauthenticated-arbitrary-file-upload-via-blc-review-images-parameterwriteuppatchstack.com/database/wordpress/plugin/blocksy-companion/vulnerability/wordpress-blocksy-companion-plugin-2-1-46-unauthenticated-arbitrary-file-upload-vulnerabilitypatchwordpress.org/plugins/blocksy-companionwriteupvulncheck.com/advisories/blocksy-companion-pro-unauthenticated-file-upload-via-save-attachments