CVE-2025-34061: Henan Xiaopi Security Technology Co., Ltd Phpstudy

Critical severity, CVSS 9.3. EPSS: 1.9% chance of exploitation in the next 30 days.

A backdoor in PHPStudy versions 2016 through 2018 allows unauthenticated remote attackers to execute arbitrary PHP code on affected installations. The backdoor listens for base64-encoded PHP payloads in the Accept-Charset HTTP header of incoming requests, decodes and executes the payload without proper validation. This leads to remote code execution as the web server user, compromising the affected system.

Affected products

• Henan Xiaopi Security Technology Co., Ltd Phpstudy: from 2016, up to and including 2018

Published 2025-07-03. Last modified 2026-06-17.