CVE-2025-34061

PHPStudy 2016-2018 Backdoor Remote Code Execution Vulnerability

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

Henan Xiaopi Security Technology Co., Ltd. · PHPStudy

CVSS v4.0 VULNCHECK

9.3 CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS

1.94% chance of exploitation in the next 30 days, 80th percentile

Published

2025-07-03

Updated

2025-07-07

Proof-of-concept exploits (1)

• https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/mul…

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/exploits/multi/http/phpstudy_backdoor_rce…

References

• CVE Record
• NVD entry