CVE-2019-25323 in Netmonitor
Summary
by MITRE • 02/13/2026
Heatmiser Netmonitor v3.03 contains an HTML injection vulnerability in the outputSetup.htm page that allows attackers to inject malicious HTML code through the outputtitle parameter. Attackers can craft specially formatted POST requests to the outputtitle parameter to execute arbitrary HTML and potentially manipulate the web interface's displayed content.
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Analysis
by VulDB Data Team • 02/13/2026
The vulnerability identified as CVE-2019-25323 resides within Heatmiser Netmonitor version 3.03, specifically in the outputSetup.htm web page component. This represents a critical security flaw that falls under the category of HTML injection attacks, where malicious code can be inserted into web applications through improperly validated user input. The vulnerability manifests through the outputtitle parameter which fails to adequately sanitize or validate incoming data before incorporating it into the web page's output. This weakness allows attackers to manipulate the application's behavior by injecting HTML code that gets executed within the context of the user's browser session.
The technical implementation of this vulnerability enables attackers to craft specially formatted POST requests that target the outputtitle parameter in the web interface. When the application processes these requests without proper input validation, the malicious HTML code becomes embedded within the outputSetup.htm page, leading to potential execution of arbitrary scripts in the victim's browser environment. This type of vulnerability directly corresponds to CWE-79 which defines Cross-Site Scripting (XSS) as a common web application security flaw where untrusted data is incorporated into web pages without proper sanitization or encoding. The attack vector operates through the web application's failure to implement proper input validation mechanisms, allowing attackers to bypass security controls and inject malicious content that can persist within the application's user interface.
The operational impact of this vulnerability extends beyond simple content manipulation, as it provides attackers with the capability to compromise user sessions and potentially escalate privileges within the application's context. When malicious HTML code is injected into the web interface, it can be executed by other users who view the affected page, creating a persistent threat that affects all users interacting with the compromised functionality. This vulnerability can enable attackers to steal session cookies, redirect users to malicious websites, or perform actions on behalf of authenticated users, making it particularly dangerous in environments where the application handles sensitive operational data. The attack can be executed without requiring authentication to the application itself, as the vulnerability exists within the web interface's handling of user-provided data.
Mitigation strategies for CVE-2019-25323 should focus on implementing robust input validation and output encoding mechanisms throughout the application's web interface. The most effective approach involves sanitizing all user-provided input, particularly parameters like outputtitle, by implementing proper validation rules that reject or escape potentially dangerous characters and code sequences. Organizations should also implement Content Security Policy (CSP) headers to limit the execution of inline scripts and restrict the sources from which scripts can be loaded. Additionally, regular security assessments and penetration testing should be conducted to identify similar vulnerabilities within the application's codebase, while also ensuring that all third-party components are kept up to date with the latest security patches. The remediation process should include comprehensive code review to address the root cause of the vulnerability and prevent similar issues from occurring in other parts of the application, aligning with ATT&CK technique T1059.005 which focuses on command and scripting interpreter usage for executing malicious code.