CVE-2023-34657 in EyouCMS
Summary
by MITRE • 06/19/2023
A stored cross-site scripting (XSS) vulnerability in Eyoucms v1.6.2 allows attackers to execute arbitrary web scripts or HTML via a crafted payload injected into the web_recordnum parameter.
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Analysis
by VulDB Data Team • 01/08/2026
The stored cross-site scripting vulnerability identified as CVE-2023-34657 affects Eyoucms version 1.6.2 and represents a critical security flaw that enables attackers to inject malicious scripts into web applications. This vulnerability specifically targets the web_recordnum parameter, which serves as an entry point for malicious payload injection. The flaw resides in the application's insufficient input validation and output encoding mechanisms, allowing attackers to persistently store malicious code that executes when other users access affected pages. The vulnerability classifies under CWE-79 which defines Cross-Site Scripting as a weakness where applications fail to properly sanitize user input before rendering it in web pages. This particular implementation allows for persistent XSS attacks where the malicious script becomes permanently stored within the application's database or storage mechanisms, making it particularly dangerous as it affects all users who interact with the vulnerable functionality.
The technical exploitation of this vulnerability requires attackers to craft malicious payloads specifically designed to target the web_recordnum parameter and inject HTML or JavaScript code that will be executed in the context of other users' browsers. The stored nature of this vulnerability means that once the malicious code is injected, it remains active and will execute whenever legitimate users access the affected application components. The attack vector typically involves submitting a crafted payload through the web_recordnum parameter during data submission or modification processes, which then gets stored in the application's backend database. This persistent storage characteristic makes the vulnerability particularly severe as it can remain active for extended periods without detection, potentially allowing attackers to perform actions such as session hijacking, credential theft, or redirection to malicious sites. The vulnerability demonstrates a failure in proper input sanitization and output encoding practices that should be implemented according to OWASP secure coding guidelines and the principle of least privilege in web application security.
The operational impact of CVE-2023-34657 extends beyond simple script execution to encompass potential complete system compromise and data breaches. Attackers can leverage this vulnerability to steal session cookies, redirect users to phishing sites, or inject malicious content that could compromise user data and application integrity. The persistent nature of stored XSS makes it particularly dangerous for applications handling sensitive information, as it can be used to maintain long-term access to compromised systems. Users who interact with the vulnerable application may unknowingly execute malicious code, leading to unauthorized access to their accounts, data exfiltration, or further exploitation through chained attacks. The vulnerability also poses risks to application availability and reputation, as successful exploitation can lead to service disruption and loss of user trust. Organizations using Eyoucms v1.6.2 are particularly vulnerable to attacks that align with ATT&CK technique T1531 which involves modifying existing programs to gain access to systems or data, and T1071.001 which covers application layer protocol usage for command and control communications.
Mitigation strategies for CVE-2023-34657 should prioritize immediate patching of the Eyoucms application to the latest version that addresses this vulnerability. Organizations must implement comprehensive input validation and output encoding mechanisms to prevent malicious payloads from being stored or executed within the application. The implementation of Content Security Policy headers can provide additional protection against XSS attacks by restricting the sources from which scripts can be loaded. Regular security audits and penetration testing should be conducted to identify and remediate similar vulnerabilities in other application components. Application developers should follow secure coding practices including parameterized queries, proper HTML escaping, and input sanitization techniques. Organizations should also implement web application firewalls and monitoring systems to detect and prevent exploitation attempts. The vulnerability highlights the importance of maintaining up-to-date software versions and implementing defense-in-depth strategies that include multiple layers of security controls to protect against persistent threats. Additionally, user education and awareness programs should be established to help users recognize potential XSS attack indicators and report suspicious activities within the application environment.