CVE-2019-25311 in thesystem
Summary
by MITRE • 02/11/2026
thesystem version 1.0 contains a persistent cross-site scripting vulnerability that allows attackers to inject malicious scripts through multiple server data input fields. Attackers can submit crafted script payloads in operating_system, system_owner, system_username, system_password, system_description, and server_name parameters to execute arbitrary JavaScript in victim browsers.
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Analysis
by VulDB Data Team • 03/12/2026
The vulnerability identified as CVE-2019-25311 represents a critical persistent cross-site scripting flaw within a system version 1.0 application that exposes multiple data input fields to malicious script injection. This weakness falls under the CWE-79 category of Cross-Site Scripting, specifically manifesting as a persistent variant where malicious code is stored on the server and executed whenever the affected page is accessed by victims. The vulnerability impacts several critical system parameters including operating_system, system_owner, system_username, system_password, system_description, and server_name fields, creating multiple attack vectors for threat actors to exploit.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding mechanisms within the application's data handling processes. When users submit data through these specified parameters, the system fails to properly sanitize or escape the input before storing and subsequently rendering it in web pages. This allows attackers to inject malicious JavaScript payloads that persist in the database and execute automatically in the context of victim browsers. The persistence aspect of this flaw means that once exploited, the malicious code remains active until manually removed from the system, creating a long-term security risk for all users who access the affected application.
The operational impact of CVE-2019-25311 extends beyond simple script execution, as it provides attackers with potential access to sensitive system information and user data. When malicious scripts execute in victim browsers, they can perform actions such as stealing session cookies, redirecting users to malicious sites, defacing web pages, or even executing additional attacks through the victim's browser context. This vulnerability directly aligns with ATT&CK technique T1566.001 for Initial Access through Spearphishing Attachment, as attackers can use the persistent XSS to deliver additional malware or phishing content. The exposure of system_username and system_password fields particularly increases the risk of credential theft and privilege escalation attacks.
Mitigation strategies for this vulnerability must address both the immediate remediation needs and long-term architectural improvements. The primary solution involves implementing comprehensive input validation and output encoding across all affected data fields, ensuring that any user-supplied content is properly sanitized before storage and rendering. This includes implementing strict whitelisting of acceptable input characters and employing context-specific encoding mechanisms for different output contexts. Additionally, the system should implement proper content security policies and utilize secure coding practices to prevent similar vulnerabilities in future development cycles. Regular security testing including automated scanning and manual penetration testing should be conducted to identify and remediate similar issues before they can be exploited by attackers. Organizations should also consider implementing web application firewalls and monitoring systems to detect and prevent exploitation attempts, while establishing incident response procedures to address successful attacks.