CVE-2026-58480 Blocksy Companion Pro < 2.1.47 Unauthenticated File Upload via save_attachments
Unauthenticated attackers can upload executable files via flawed extension validation in Blocksy Companion Pro, leading to remote code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-58480?
CVE-2026-58480 is a critical vulnerability in Creative Themes Blocksy Companion, published on 8 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-434
Which versions are affected by CVE-2026-58480?
How do I fix CVE-2026-58480?
No fix has been published for CVE-2026-58480 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-58480 being exploited?
There is no known exploitation of CVE-2026-58480 in the wild and no public exploit code.
Public exploit code: 1 Exploit-DB entry and 1 proofs of concept on GitHub.
Sources
Also known as GHSA-r58f-77hp-phcj.