CVE-2021-39473 in HotelManager
Summary
by MITRE • 11/04/2022
Saibamen HotelManager v1.2 is vulnerable to Cross Site Scripting (XSS) due to improper sanitization of comment and contact fields.
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Analysis
by VulDB Data Team • 05/03/2025
The vulnerability identified as CVE-2021-39473 affects Saibamen HotelManager version 1.2 and represents a critical cross site scripting flaw that stems from inadequate input validation and sanitization mechanisms within the application's comment and contact field processing. This vulnerability exposes the system to malicious actors who can inject arbitrary javascript code through user input fields, potentially compromising the integrity and confidentiality of the application's data and user interactions. The flaw specifically manifests when the application fails to properly sanitize user-supplied data before rendering it back to users, creating an environment where attacker-controlled scripts can execute within the context of other users' browsers. The vulnerability aligns with CWE-79 which categorizes cross site scripting as a fundamental web application security weakness, and it directly maps to ATT&CK technique T1566.001 for the initial access phase through malicious web content. The improper sanitization of comment and contact fields creates a persistent vector for exploitation since these are common user interaction points that typically receive untrusted input from multiple sources. When users view pages containing maliciously crafted input, the injected scripts execute in their browser context, potentially leading to session hijacking, credential theft, or redirection to malicious websites. The vulnerability impacts the application's overall security posture by creating a persistent attack surface that can be leveraged for more sophisticated attacks, including those targeting user sessions or escalating privileges within the application. This flaw particularly threatens the application's user trust model since legitimate users may unknowingly interact with malicious content that was injected by other users or attackers who have exploited this vulnerability. The XSS vulnerability can be exploited through various vectors including stored XSS where malicious payloads are permanently stored on the server and executed whenever users view affected pages, or reflected XSS where payloads are immediately reflected back to users through malicious links or forms. The impact extends beyond simple script execution to include potential data exfiltration, as attackers can craft payloads that steal cookies, session tokens, or other sensitive information from users' browsers. The vulnerability's exploitation requires minimal technical skill and can be automated, making it particularly dangerous in environments where multiple users interact with the application. Security controls such as content security policies, proper input validation, and output encoding should have been implemented to prevent this class of vulnerability, but the absence of these protections in Saibamen HotelManager v1.2 leaves users exposed to potential exploitation. The remediation approach should focus on implementing comprehensive input sanitization mechanisms, output encoding for all dynamic content, and proper validation of user inputs before processing or storage. Additionally, the application should implement proper security headers and content security policies to mitigate the impact of any potential XSS attacks that may still occur despite preventive measures. Regular security testing and code reviews should be conducted to identify and remediate similar vulnerabilities in other components of the application. Organizations using this software should immediately implement patches or updates that address the input validation and sanitization deficiencies to protect against potential exploitation attempts. The vulnerability demonstrates the critical importance of secure coding practices and input validation in web applications, particularly in systems that handle user-generated content where proper sanitization is essential for maintaining application security and user trust.