CVE-2023-37135 in EyouCMS
Summary
by MITRE • 07/06/2023
A stored cross-site scripting (XSS) vulnerability in the Image Upload module of eyoucms v1.6.3 allows attackers to execute arbitrary web scripts or HTML via a crafted payload.
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Analysis
by VulDB Data Team • 01/16/2026
The CVE-2023-37135 vulnerability represents a critical stored cross-site scripting flaw within the Image Upload module of eyoucms version 1.6.3, exposing web applications to persistent malicious script execution. This vulnerability falls under the CWE-79 category, which specifically addresses cross-site scripting conditions where untrusted data is improperly integrated into web pages without proper sanitization or encoding mechanisms. The flaw exists in the image upload functionality, where user-supplied file names or metadata are not adequately validated or escaped before being rendered in web page contexts, creating an attack surface for malicious actors to inject persistent script payloads.
The technical implementation of this vulnerability stems from insufficient input validation within the image upload module's processing pipeline. When users upload images, the system fails to properly sanitize file names, descriptions, or metadata associated with uploaded media files. Attackers can craft malicious payloads that include script tags or other executable code within these upload fields, which are then stored in the application's database or file system. Upon subsequent page requests or image display operations, these stored malicious scripts execute within the context of other users' browsers, leveraging the trust relationship between the web application and its visitors.
The operational impact of CVE-2023-37135 extends beyond simple script execution, potentially enabling attackers to perform session hijacking, steal sensitive cookies, redirect users to malicious domains, or even execute full browser-based attacks against authenticated users. This stored nature of the vulnerability means that malicious payloads persist indefinitely until manually removed, creating a long-term threat vector that can affect multiple users over extended periods. The vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under T1531 for credential access and T1566 for initial access through malicious file uploads, making it particularly dangerous in environments where administrators or other users regularly interact with uploaded media content.
Mitigation strategies for this vulnerability should prioritize immediate input validation and output encoding within the image upload module. Implementing strict sanitization of all user-supplied data, including file names and metadata, using established libraries such as HTML Purifier or OWASP Java HTML Sanitizer, can effectively prevent malicious script injection. Additionally, employing Content Security Policy headers, proper HTTPOnly and Secure flags for cookies, and implementing robust file type validation can further reduce the attack surface. Organizations should also consider implementing automated scanning tools and regular security assessments to identify similar vulnerabilities in other modules of the eyoucms platform, as the presence of one XSS vulnerability often indicates potential weaknesses in input handling throughout the application. The vulnerability demonstrates the critical importance of proper data sanitization in web applications and aligns with security best practices outlined in the OWASP Top Ten Project, specifically addressing the prevention of cross-site scripting vulnerabilities in content management systems.