CVE-2025-57543 in NetBox
Summary
by MITRE • 03/16/2026
Cross Site scripting vulnerability (XSS) in NetBox 4.3.5 "comment" field on object forms. An attacker can inject arbitrary HTML, which will be rendered in the web UI when viewed by other users. This could potentially lead to user interface redress attacks or be escalated to XSS in certain contexts.
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Analysis
by VulDB Data Team • 03/21/2026
The vulnerability identified as CVE-2025-57543 represents a critical cross site scripting flaw within NetBox version 4.3.5, specifically affecting the comment field functionality on object forms. This issue resides in the web application's user interface rendering mechanism where user-provided content in the comment field is not properly sanitized before being displayed to other users. The vulnerability manifests when an attacker crafts malicious HTML content within the comment field that gets executed in the browser context of legitimate users who view the affected objects. This type of vulnerability falls under the CWE-79 category of Cross Site Scripting, which is classified as a fundamental web application security weakness that allows attackers to inject client-side scripts into web pages viewed by other users.
The technical exploitation of this vulnerability occurs through the improper handling of user input within the NetBox web interface. When users submit comments containing malicious HTML or JavaScript code through the object forms, the application fails to implement adequate input validation and output encoding mechanisms. The comment field serves as an entry point for attackers to inject malicious payloads that can execute within the context of other users' browser sessions. The vulnerability's impact extends beyond simple script execution as it can enable more sophisticated attacks including user interface redress attacks where attackers manipulate the visual presentation of the application to deceive users. This particular vulnerability demonstrates a failure in the application's defense-in-depth strategy, where input sanitization should occur at multiple layers to prevent malicious content from being processed and rendered.
The operational impact of CVE-2025-57543 is significant as it compromises the integrity and security of the NetBox environment, which is commonly used for network infrastructure management and documentation. Attackers can leverage this vulnerability to steal session cookies, perform actions on behalf of authenticated users, or redirect users to malicious websites. The potential for escalation exists in environments where users have elevated privileges or where the application integrates with other systems that might be vulnerable to similar attacks. This vulnerability can be particularly dangerous in enterprise environments where NetBox serves as a central repository for network information and configuration data, as successful exploitation could lead to unauthorized access to critical network infrastructure details. The vulnerability also aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter: JavaScript, and T1531 for Account Access Removal, as it enables attackers to execute malicious scripts and potentially manipulate user sessions.
Mitigation strategies for CVE-2025-57543 should focus on implementing robust input validation and output encoding mechanisms throughout the NetBox application. Organizations should immediately apply the vendor-provided patch or upgrade to a version that addresses this vulnerability. Until a fix is applied, administrators should implement additional protective measures including restricting user permissions for comment fields, implementing content security policies, and monitoring user-generated content for suspicious patterns. The solution should incorporate proper HTML escaping and sanitization techniques to ensure that any user-provided content is rendered safely in the browser context. Security teams should also conduct thorough code reviews to identify similar input handling vulnerabilities in other parts of the application and implement comprehensive logging and monitoring to detect potential exploitation attempts. The remediation process should align with security best practices outlined in OWASP Top 10 and NIST Cybersecurity Framework to ensure comprehensive protection against similar vulnerabilities.