What is CVE-2026-58480?

CVE-2026-58480 is a critical-severity vulnerability in Creative Themes Blocksy Companion, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2026-07-08.

How severe is CVE-2026-58480?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2026-58480 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Arbitrary file upload in Creative Themes Blocksy Companion

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.

Vulnerability class: Unrestricted File Upload

Published 2026-07-08 · last modified 2026-07-08.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.036 (89.0th percentile), scored 2026-10-08.

Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 89.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.036 · newest: 0.036 · change: 0.000

Affected products

Creative Themes Blocksy Companion — versions 0, 2.1.47

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

Public proof-of-concept exploits

shinthink/CVE-2026-58480

References

www.wordfence.com/threat-intel/vulnerabilities/wordpress-plugins/blocksy-compan… (third-party-advisory)
patchstack.com/database/wordpress/plugin/blocksy-companion/vulnerability/wordpr… (third-party-advisory)
wordpress.org/plugins/blocksy-companion/ (product, patch)
www.vulncheck.com/advisories/blocksy-companion-pro-unauthenticated-file-upload-… (third-party-advisory)

Frequently asked questions

What is CVE-2026-58480?: CVE-2026-58480 is a critical-severity vulnerability in Creative Themes Blocksy Companion, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2026-07-08.
How severe is CVE-2026-58480?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2026-58480 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.