CRITICAL: CVE-2026-58480 (CVSS 9.8) — multiple products
CVE: CVE-2026-58480
CVSS: 9.8 (3.1) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity: CRITICAL
Status: Critical advisory
Affected
_See vendor advisory_
Summary
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.
Verified Sources
References
- https://patchstack.com/database/wordpress/plugin/blocksy-companion/vulnerability/wordpress-blocksy-companion-plugin-2-1-46-unauthenticated-arbitrary-file-upload-vulnerability
- https://wordpress.org/plugins/blocksy-companion/
- https://www.vulncheck.com/advisories/blocksy-companion-pro-unauthenticated-file-upload-via-save-attachments
- https://www.wordfence.com/threat-intel/vulnerabilities/wordpress-plugins/blocksy-companion/blocksy-companion-2146-unauthenticated-arbitrary-file-upload-via-blc-review-images-parameter
_Validated by the Lyrie Threat Intelligence Pipeline — 3 independent sources confirmed before publication. No speculation._
Lyrie Verdict
A vulnerability of this severity is exactly what Lyrie's anti-rogue-AI defense is built for: continuous, autonomous monitoring that doesn't wait for human reaction time.
Validated sources
- [1]NVD
- [2]GitHub Advisory
- [3]MITRE