CVE-2019-11449 in I
Summary
by MITRE
I, Librarian 4.10 has XSS via the notes.php notes parameter.
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Analysis
by VulDB Data Team • 12/10/2025
The vulnerability identified as CVE-2019-11449 affects I, Librarian version 4.10 and represents a cross-site scripting flaw that allows remote attackers to inject malicious scripts into the application's notes parameter. This vulnerability resides within the notes.php script where user input is not properly sanitized or validated before being rendered back to users. The flaw enables attackers to execute arbitrary JavaScript code within the context of other users' browsers, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of victims.
The technical implementation of this vulnerability stems from insufficient input validation and output encoding practices within the application's web interface. When users submit notes through the notes.php endpoint, the application fails to properly escape or filter special characters that could be interpreted as HTML or JavaScript code. This weakness directly maps to CWE-79 which defines Cross-Site Scripting as a common web application vulnerability occurring when applications include untrusted data in web pages without proper validation or escaping. The vulnerability can be exploited by crafting malicious payloads containing script tags or other executable code within the notes parameter, which then gets executed when other users view the affected content.
The operational impact of this vulnerability extends beyond simple script execution, as it creates a persistent threat vector that can be leveraged for more sophisticated attacks. An attacker could craft malicious notes containing phishing scripts that steal session cookies, redirect users to malicious sites, or perform actions on behalf of authenticated users. This vulnerability particularly affects collaborative environments where users share notes and information, as the malicious code could be embedded in seemingly legitimate content and executed when other users access the shared notes. The attack surface is broadened by the fact that this is a stored XSS vulnerability, meaning the malicious payload persists in the application's database and affects all users who view the compromised content.
Mitigation strategies for CVE-2019-11449 should focus on implementing proper input validation and output encoding mechanisms throughout the application. The primary defense involves sanitizing all user input through strict validation and encoding before rendering any content in web pages. This includes implementing Content Security Policy headers to restrict script execution, using proper HTML escaping functions for dynamic content, and employing parameterized queries to prevent injection attacks. Organizations should also consider implementing web application firewalls to detect and block suspicious payloads, conducting regular security audits of input handling mechanisms, and applying the latest security patches provided by the software vendor. Additionally, user education about the risks of clicking on suspicious links or content within shared applications can help reduce the likelihood of successful exploitation. The vulnerability aligns with ATT&CK technique T1566 which covers social engineering tactics that leverage web-based attacks, making comprehensive security measures essential for protecting against both automated exploitation and targeted social engineering campaigns.