CVE-2026-73781 in AOS-CX
Summary
by MITRE • 09/02/2026
A vulnerability in the web-based management interface of AOS-CX could allow an authenticated remote attacker to conduct a stored cross-site scripting (XSS) attack against an administrative user of the interface. A successful exploit allows an attacker to execute arbitrary script code in a victim's browser in the context of the affected interface.
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Analysis
by VulDB Data Team • 09/02/2026
The vulnerability identified within the ArubaOS-CX web-based management interface represents a significant security risk, specifically classified as a stored cross-site scripting (XSS) flaw that targets authenticated administrative users. This type of vulnerability arises when an application stores user-supplied input without proper validation or encoding and subsequently serves it to other users in a way that causes the browser to execute malicious scripts. In this specific context, the attack vector requires prior authentication, meaning the threat actor must possess valid credentials for the management interface before they can inject the malicious payload. Once authenticated, an attacker can manipulate data fields within the administrative console, such as configuration parameters or log entries, which are then persistently stored on the server side rather than being transient in a URL parameter or HTTP header. This persistence is what distinguishes it from reflected XSS and makes it particularly dangerous, as the malicious code does not require social engineering to trigger; instead, it waits passively for any administrator with sufficient privileges to access the affected page.
From a technical perspective, this flaw indicates insufficient sanitization of input data at both the entry point and the rendering layer of the web application. When an authenticated user submits content containing executable JavaScript code, the system fails to escape special characters or strip out script tags effectively before storing them in its database or configuration files. Consequently, when another administrative user views that specific section of the management interface, their browser interprets the stored data as active code rather than static text. This execution occurs within the security context of the web application's domain, granting the attacker full access to all cookies, session tokens, and local storage associated with that site. The impact is severe because it allows for complete compromise of the administrative account, enabling the attacker to perform any action available to a legitimate administrator, including changing network configurations, disabling security features, or exfiltrating sensitive network topology data.
The operational impact extends beyond immediate credential theft. An attacker leveraging this vulnerability can establish persistent access by creating backdoor accounts or modifying firewall rules to allow unauthorized traffic. Furthermore, the ability to execute arbitrary scripts in the context of an administrative interface facilitates session hijacking and privilege escalation scenarios where the attacker might interact with other parts of the network management infrastructure that rely on single sign-on mechanisms or shared trust relationships. This aligns closely with Common Weakness Enumeration (CWE) ID 79, which covers Improper Neutralization of Input During Web Page Generation known as Cross-site Scripting. Specifically, this instance falls under CWE-80 due to the stored nature of the payload, and it maps directly to the MITRE ATT&CK technique T1059.007, representing JavaScript execution within a browser environment. The attack path typically involves initial access through valid credentials followed by exploitation for credential harvesting or further lateral movement across the managed network infrastructure.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. Vendors should apply available software patches that address input validation logic to ensure all user-supplied data is strictly sanitized before storage and properly encoded during output rendering. For administrators unable to patch immediately, implementing strict access controls via a bastion host or jump server can limit exposure by ensuring only highly trusted systems interact with the management interface. Additionally, deploying Web Application Firewalls (WAFs) configured with rulesets designed to detect and block XSS payloads can provide an additional layer of defense against exploitation attempts. Security teams should also enforce multi-factor authentication for all administrative accounts to reduce the risk associated with compromised credentials and conduct regular audits of user inputs within the management interface to identify any residual vulnerabilities in data handling processes.