CVE-2021-47911 in Affiliate Pro
Summary
by MITRE • 02/01/2026
Affiliate Pro 1.7 contains multiple reflected cross-site scripting vulnerabilities in the index module's input fields. Attackers can inject malicious scripts through fullname, username, and email parameters to execute client-side attacks and manipulate browser requests.
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Analysis
by VulDB Data Team • 02/03/2026
The vulnerability identified as CVE-2021-47911 affects the Affiliate Pro 1.7 application which is susceptible to multiple reflected cross-site scripting flaws within its index module. This represents a critical security weakness that allows malicious actors to inject client-side scripts into web applications through improperly sanitized input parameters. The specific attack vectors involve the fullname, username, and email parameters that are processed by the index module, creating an environment where attacker-controlled data can be executed within the victim's browser context.
The technical flaw stems from insufficient input validation and output encoding mechanisms within the application's web interface. When user-supplied data is directly incorporated into web responses without proper sanitization, it creates opportunities for attackers to embed malicious scripts that will execute in the context of other users' browsers. This reflected XSS vulnerability operates by tricking users into clicking malicious links that contain script payloads, which are then reflected back by the application and executed in the victim's browser. The vulnerability aligns with CWE-79 which specifically addresses Cross-Site Scripting flaws in web applications.
The operational impact of this vulnerability extends beyond simple script execution as it enables attackers to perform various malicious activities including session hijacking, credential theft, and redirection to malicious websites. An attacker could craft payloads that steal session cookies, allowing unauthorized access to user accounts, or redirect victims to phishing pages designed to capture sensitive information. The reflected nature of the vulnerability means that the malicious script must be embedded in a URL or form submission that is then processed by the vulnerable application, making it particularly dangerous in scenarios where users might encounter these links in email communications or web forums.
From a threat modeling perspective, this vulnerability fits within the ATT&CK framework under the T1566 technique for Phishing and T1203 technique for Exploitation for Client Execution. The attack chain typically begins with an attacker identifying the vulnerable parameters and crafting malicious payloads that exploit the reflected XSS weakness. Security professionals should note that this vulnerability particularly affects web applications that process user input through multiple parameters without proper sanitization. The risk is elevated in environments where users have varying privilege levels as successful exploitation could lead to privilege escalation or unauthorized access to sensitive data.
Mitigation strategies should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application. The most effective approach involves sanitizing all user inputs before they are processed or displayed, using context-appropriate encoding techniques such as HTML entity encoding for web content. Additionally, implementing proper Content Security Policy headers can significantly reduce the impact of successful XSS attacks by limiting the sources from which scripts can be executed. Regular security testing including automated scanning and manual penetration testing should be conducted to identify similar vulnerabilities in other application modules. Organizations should also consider implementing web application firewalls to detect and block suspicious input patterns that could indicate XSS attack attempts. The vulnerability serves as a reminder of the importance of following secure coding practices and maintaining regular security assessments to identify and remediate such critical flaws in web applications.