CVE-2019-11428 in I
Summary
by MITRE
I, Librarian 4.10 has XSS via the export.php export_files parameter.
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Analysis
by VulDB Data Team • 12/10/2025
The vulnerability identified as CVE-2019-11428 represents a cross-site scripting flaw within the I, Librarian 4.10 web application that specifically affects the export.php script. This issue arises from inadequate input validation and output sanitization mechanisms when processing the export_files parameter, creating an avenue for malicious actors to inject and execute arbitrary JavaScript code within the context of a victim's browser session. The vulnerability manifests when users interact with the library management system's export functionality, which is commonly used to generate reports and data exports for various purposes including catalog maintenance and user management.
The technical exploitation of this vulnerability occurs through manipulation of the export_files parameter in the export.php endpoint, where user-supplied input is directly incorporated into the HTTP response without proper sanitization or encoding. This allows attackers to inject malicious scripts that execute in the browser context of authenticated users, potentially leading to session hijacking, credential theft, or unauthorized administrative actions. The flaw aligns with CWE-79, which categorizes cross-site scripting vulnerabilities as weaknesses in input validation and output encoding, specifically addressing the failure to properly escape or sanitize user-controllable data before incorporating it into dynamically generated web content.
From an operational perspective, this vulnerability presents significant risks to library management systems that rely on I, Librarian for catalog maintenance and user data handling. An attacker could exploit this flaw to gain unauthorized access to sensitive bibliographic data, user records, or administrative functions by crafting malicious export requests that would execute in the browser of any user who clicks on the compromised export link. The impact extends beyond simple data exposure as the vulnerability could enable privilege escalation attacks, particularly if the affected users possess administrative privileges within the library system. This type of vulnerability also aligns with ATT&CK technique T1059.007, which covers the use of scripts and command-line interfaces for execution, as the XSS payload could potentially leverage the browser's scripting capabilities to perform further malicious activities.
The mitigation strategies for CVE-2019-11428 should prioritize immediate input validation and output encoding implementations within the export.php script. Developers must ensure that all user-supplied parameters are properly sanitized before being processed or returned in HTTP responses, implementing context-appropriate encoding mechanisms such as HTML entity encoding for web content. Additionally, the application should implement proper parameter validation to reject or sanitize any input containing potentially dangerous characters or script tags. Organizations should also consider implementing Content Security Policy (CSP) headers to provide additional protection against XSS attacks by restricting the sources from which scripts can be executed. The vulnerability demonstrates the critical importance of input validation and output encoding practices in web application security, as outlined in OWASP Top Ten categories and various security frameworks that emphasize the need for defense-in-depth strategies to protect against client-side attacks.