CVE-2026-58480

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.

CVSS v4.0

9.2 CRITICALCVSS: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

CVSS v3.1

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

EPSS

3.57% chance of exploitation in the next 30 days, 89th percentile

Published

2026-07-08

Updated

2026-07-14

Proof-of-concept exploits (1)

• shinthink/CVE-2026-584803★ · 2026-07-26

ExploitDB entries (1)

• https://www.exploit-db.com/exploits/52640

References

• CVE Record
• NVD entry

Related

• CVE-2025-32044
• CVE-2026-13001
• CVE-2026-14894
• CVE-2026-15158
• CVE-2026-15282
• CVE-2026-3891