CVE-2026-40464 in NSP
Summary
by MITRE • 08/31/2026
NSP is vulnerable to a stored XSS due to insufficient validation or encoding of user-controlled input in a workflow application. An authenticated attacker with access to the workflow application could embed harmful code that runs when another user views the content.
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Analysis
by VulDB Data Team • 08/31/2026
The vulnerability identified within the Network Service Platform, specifically designated as NSP, represents a classic instance of Stored Cross-Site Scripting, commonly referred to in industry standards as CWE-79. This flaw stems from an insufficient validation or encoding mechanism applied to user-controlled input fields within a specific workflow application integrated into the platform. Unlike reflected XSS attacks where malicious scripts are executed immediately upon request processing, stored vulnerabilities persist by saving the injected payload on the target server. In this scenario, the attacker exploits the lack of sanitization in data entry points associated with the workflow management system. Once an authenticated user submits content containing malicious JavaScript code, the application stores this input without adequately neutralizing special characters or script tags. Consequently, when any other authorized user accesses the affected page to view the stored information, their browser interprets and executes the embedded script as part of the legitimate web page content.
The operational impact of this vulnerability is significant due to its persistent nature and the requirement for authentication. Because the attack vector requires an authenticated attacker with access to the workflow application, it targets a specific subset of users who possess elevated privileges or regular interaction with these workflows. However, once the payload is stored, the exploitation does not require further direct intervention from the initial attacker. Any subsequent user viewing the compromised content becomes a victim automatically upon page load. This mechanism allows for session hijacking, where the malicious script can steal sensitive cookies or authentication tokens, potentially granting the attacker full control over the victim's account. Furthermore, it enables credential harvesting through deceptive login forms injected into the workflow interface, phishing attacks that trick users into revealing personal information, and defacement of the application’s user interface to spread misinformation or damage organizational reputation.
From a tactical perspective aligned with the MITRE ATT&CK framework, this vulnerability facilitates techniques such as Client-side Scripting Injection (T1059) for executing arbitrary code within the victim's browser context. It also supports Credential Access via Browser Cookie Stealing (T1539) and potentially Phishing (T1566) if social engineering elements are incorporated into the payload. The persistence of the attack means that remediation is not merely about patching a single input field but requires a comprehensive review of all data entry points within the workflow application to ensure consistent sanitization practices.
Mitigation strategies must focus on implementing robust output encoding and strict input validation at both the client and server levels. Developers should employ context-aware escaping techniques, such as HTML entity encoding for content displayed in web pages, JavaScript string escaping for dynamic script generation, and URL encoding for data inserted into URLs. Additionally, adopting a Content Security Policy (CSP) can significantly reduce the impact of any successful XSS attack by restricting the sources from which scripts are allowed to load or execute. Regular security testing, including automated static analysis tools and manual penetration testing focused on input validation logic, is essential to identify similar weaknesses across other modules within the NSP environment. Ensuring that all user inputs are treated as untrusted data until explicitly validated against a whitelist of acceptable characters can effectively neutralize this class of threats.