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CVE-2025-8877: Critical SQL Injection Vulnerability in AffiliateWP WordPress Plugin

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Overview

This report covers a severe SQL Injection vulnerability found in the AffiliateWP plugin for WordPress applications, identified as CVE-2025-8877. The flaw can allow unauthenticated attackers to manipulate SQL queries and extract sensitive information from the database. Given the widespread use of the WordPress platform and the AffiliateWP plugin, this vulnerability can have significant impact on a large number of websites.

Vulnerability Summary

CVE ID: CVE-2025-8877
Severity: High (CVSS: 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage

Affected Products

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Product | Affected Versions

AffiliateWP WordPress Plugin | Up to and including 2.28.2

How the Exploit Works

The vulnerability lies in the ‘ajax_get_affiliate_id_from_login’ function of the AffiliateWP plugin. The function does not properly escape user input, and thus fails to prevent the injection of malicious SQL code. This allows unauthenticated attackers to append additional SQL queries into already existing queries and extract sensitive information from the database.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited. This example represents a malicious HTTP request targeting the vulnerable function:

POST /wp-admin/admin-ajax.php?action=affwp_get_affiliate_id_from_login HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
login=' OR '1'='1'; --

In this request, the attacker posts a payload to the ‘affwp_get_affiliate_id_from_login’ action which is vulnerable to SQL injection. The payload `OR ‘1’=’1’` is a classic SQL injection technique that can allow the attacker to bypass authentication or extract information from the database.

Mitigation

To mitigate this vulnerability, it is recommended to apply the patch provided by the vendor as soon as possible. If an immediate patching is not possible, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. Always ensure to adopt the principle of least privilege and validate and sanitize all user inputs to minimize the attack surface.

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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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