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CVE-2025-34061VulnerabilityPublished Updated

CVE-2025-34061: Henan Xiaopi Security Technology PHPStudy · Code Injection

Affects Henan Xiaopi Security Technology PHPStudySource CVE Database V5

0

Not known to be exploited · public exploit available (Metasploit) · CVSS 9.3 Critical.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 4.0 base score
9.3Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
1.9% chance of exploitation in 30 days – higher than 80% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Jul 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: evidence found.

    1 Metasploit module

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.

What to do

Affected software

ProductAffectedFixed in
Henan Xiaopi Security Technology Co., Ltd. PHPStudyAffected
  • =2016
Fixed in–

AI-suggested

Given the absence of official patches, European organizations should take immediate and specific actions: 1) Identify and inventory all PHPStudy 2016 installations within their environment. 2) Immediately isolate affected systems from public networks to prevent remote exploitation. 3) Replace PHPStudy 2016 with updated, secure PHP development environments or server stacks that do not contain backdoors. 4) Implement strict network-level controls such as web application firewalls (WAFs) configured to block or alert on suspicious HTTP headers, particularly anomalous Accept-Charset values containing base64-encoded data. 5) Employ intrusion detection/prevention systems (IDS/IPS) with custom signatures targeting this backdoor’s communication pattern. 6) Conduct thorough forensic analysis and monitoring for signs of compromise on systems that previously ran PHPStudy 2016. 7) Educate development teams about the risks of using untrusted or outdated software stacks and enforce policies to use only vendor-supported and verified tools. 8) Regularly audit HTTP traffic logs for unusual header usage that could indicate exploitation attempts. These targeted mitigations go beyond generic advice by focusing on detection and containment of the specific backdoor behavior and eliminating the vulnerable software.

Description

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.

References

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