A reflected Cross-Site Scripting (XSS) vulnerability exists in Anon Proxy Server v0.104. This vulnerability allows an attacker to execute JavaScript code in the victim's browser by sending a malicious URL. The impact of this vulnerability is notable as it can be exploited to steal sensitive user data, such as session cookies, or to perform actions on behalf of the user. The vulnerability affects the 'host' parameter in the '/diagconnect.php' endpoint.
The severity of this vulnerability is classified as medium, with a CVSS score of 5.1. Organizations must understand the potential risks associated with this vulnerability, particularly how it may allow unauthorized access to user data. The ability of attackers to execute JavaScript in a victim's browser poses a significant threat, especially if users are tricked into clicking on a malicious link.
As of now, there is no confirmed public exploit for this vulnerability, and it is not listed in the Known Exploited Vulnerabilities (KEV) catalog. Nonetheless, organizations should prioritize patching this vulnerability immediately to mitigate risk.
In conclusion, while the current exploitation status indicates no known exploits, the nature of this vulnerability necessitates urgent attention. Organizations should address this vulnerability in their priority patch cycle to protect their users and sensitive data.
Vulnerability Details
The reflected Cross-Site Scripting (XSS) vulnerability in Anon Proxy Server v0.104 is classified under CWE-79. The vulnerability allows an attacker to execute JavaScript code, potentially leading to significant information theft. The CVSS v4.0 score of 5.1 indicates a medium severity level, with an attack vector categorized as network-based, and a low attack complexity. User interaction is required, as victims need to click on the malicious link for the exploit to succeed.
The affected product is the Anon Proxy Server, specifically version 0.104, as identified by the CPE criteria. This vulnerability was published on March 31, 2026, with the last modification recorded on April 7, 2026.
Technical Analysis
The root cause of this vulnerability stems from improper handling of user input within the Anon Proxy Server application. Specifically, the application does not adequately validate or sanitize input in the 'host' parameter of the '/diagconnect.php' endpoint, allowing attackers to inject malicious scripts into web pages viewed by other users.
The attack vector for this vulnerability is network-based, meaning that an attacker can exploit it remotely without physical access to the target system. The attack complexity is low, as the attacker does not require special privileges to exploit this vulnerability. User interaction is necessary, as the victim must click a malicious link crafted by the attacker.
The vulnerability does not impact the confidentiality, integrity, or availability of the affected systems directly; however, it can lead to unauthorized data access and manipulation by executing arbitrary scripts in the context of the user's browser. This could result in session hijacking, data theft, or other malicious actions.
Risk & Impact Analysis
The real-world deployment risk associated with this vulnerability is significant. Attackers could exploit it to gain unauthorized access to sensitive user information, impacting not only individual users but also the reputation and trustworthiness of the organization hosting the Anon Proxy Server.
The potential blast radius is broad, as this vulnerability could affect all users interacting with the compromised application. Organizations must understand that even a single successful exploitation can lead to widespread consequences, including data breaches and loss of customer trust.
Given the medium CVSS score of 5.1, organizations should assess the urgency of addressing this vulnerability. While it is not classified as critical, the potential for exploitation remains, and organizations should plan to include this in their priority patch cycle.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerable version of the Anon Proxy Server is v0.104. Organizations using this version should prioritize remediation efforts.
Mitigation & Remediation
Organizations should patch the Anon Proxy Server to the latest version to remediate this vulnerability. If a patch is not immediately available, consider implementing input validation and sanitization for all user inputs, particularly in the 'host' parameter of the '/diagconnect.php' endpoint.
Additionally, organizations should strengthen their security posture by conducting regular security assessments. Continuous monitoring and penetration testing can help identify and address security weaknesses before they are exploited.
For more detailed guidance on how to effectively test and secure applications, organizations can refer to our penetration testing services.
Detection Guidance
Organizations should monitor for unusual behavior related to user input handling and JavaScript execution. Logging user interactions, especially those involving the 'diagconnect.php' endpoint, can provide insights into potential exploitation attempts. Anomalies in user sessions or unexpected JavaScript executions should be investigated promptly.
AppSecure Threat Intelligence Insight
The long-term significance of this reflected XSS vulnerability lies in the increasing prevalence of similar vulnerabilities in web applications. Organizations must recognize this trend and take proactive measures to mitigate the associated risks.
This vulnerability serves as a reminder that even low-severity issues can have serious ramifications if left unaddressed. Security teams should adopt a holistic approach to vulnerability management, ensuring that all potential threats are assessed and remediated.
For further insights on improving security practices, organizations can refer to our penetration testing methodology guide and the importance of a comprehensive vulnerability management program to strengthen their defenses.
In summary, the reflected XSS vulnerability in Anon Proxy Server v0.104 exemplifies the need for continuous vigilance in application security. Organizations should take immediate action to address this vulnerability and enhance their security posture.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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