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Description

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.

PUBLISHED Reserved 2026-06-30 | Published 2026-07-08 | Updated 2026-07-14 | Assigner VulnCheck




CRITICAL: 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

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

Problem types

Unrestricted Upload of File with Dangerous Type

Product status

Default status
affected

Any version
affected

2.1.47 (semver)
unaffected

Credits

Nguyen Ba Khanh finder

References

www.wordfence.com/...-upload-via-blc-review-images-parameter (Wordfence Advisory) third-party-advisory

patchstack.com/...icated-arbitrary-file-upload-vulnerability (Patchstack Advisory) third-party-advisory

wordpress.org/plugins/blocksy-companion/ (WordPress Plugin Page) product patch

www.vulncheck.com/...icated-file-upload-via-save-attachments third-party-advisory

cve.org (CVE-2026-58480)

nvd.nist.gov (CVE-2026-58480)

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