CVE-2026-82769 in RP-WAH-SR Series
Summary
by MITRE • 09/14/2026
Cross-site scripting vulnerability exists in Contec RP-WAH-SR Series. If this vulnerability is exploited, an arbitrary script may be executed on a logged-in user's web browser.
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Analysis
by VulDB Data Team • 09/14/2026
The identified security flaw represents a classic Cross-Site Scripting (XSS) vulnerability within the management interface of the Contec RP-WAH-SR series hardware devices. This type of weakness typically arises when an application, in this case the device’s web-based administrative console, fails to properly validate, sanitize, or encode user-supplied input before including it in the output sent back to a client's browser. The core technical issue lies in the lack of effective separation between executable code and untrusted data. When a malicious actor crafts specific HTTP requests containing embedded JavaScript payloads, the vulnerable application processes these inputs without adequate filtering mechanisms. Consequently, when an authenticated administrator or user views the affected page, their web browser interprets the injected script as legitimate content originating from the trusted domain of the device’s management interface. This failure to enforce strict input validation and output encoding allows attackers to bypass same-origin policy restrictions, which are fundamental security features designed to prevent malicious scripts on one site from accessing data or performing actions on another site.
The operational impact of exploiting this vulnerability is significant due to the context in which it occurs: a logged-in user session. Because the attack vector targets users who have already authenticated with administrative privileges, the consequences extend far beyond simple defacement or minor annoyance. An attacker can execute arbitrary scripts within the security context of the application, effectively gaining full control over the victim's interaction with the device. This capability allows for session hijacking, where the attacker steals sensitive cookies or authentication tokens to impersonate the legitimate user without needing their credentials. Furthermore, the vulnerability enables keylogging capabilities, allowing the capture of keystrokes entered into the management interface, including passwords and configuration changes. Attackers can also perform actions on behalf of the victim, such as modifying network settings, disabling security features, or installing malicious firmware updates, thereby compromising the integrity and availability of the entire network infrastructure connected to this device.
From a classification perspective, this vulnerability aligns with CWE-79: Improper Neutralization of Input During Web Page Generation, commonly known as Cross-site Scripting (XSS). Specifically, it falls under stored or reflected XSS depending on whether the malicious payload is persisted in the server's database or executed immediately within the HTTP response. In terms of offensive security frameworks, this exploit maps to MITRE ATT&CK technique T1059: Command and Scripting Interpreter, specifically JavaScript execution via browser-based attacks. It also relates to T1534: Internal Spearphishing if used for lateral movement, or more directly to credential theft mechanisms associated with session manipulation. The vulnerability highlights a critical gap in the secure development lifecycle of embedded web applications, where input sanitization is often overlooked in favor of functional completeness and ease of use.
Mitigation strategies must address both immediate remediation and long-term architectural improvements. The primary technical fix involves implementing robust output encoding for all user-controllable data rendered in HTML contexts, ensuring that special characters such as ampersands, less-than signs, greater-than signs, quotes, and apostrophes are converted to their corresponding HTML entities. Additionally, input validation should be enforced on the server side to reject any requests containing suspicious script tags or event handlers like onload or onclick. Deploying a Content Security Policy (CSP) header can further mitigate the impact by restricting the sources from which scripts can be loaded and executed, thereby neutralizing many XSS attacks even if they are not fully prevented at the input stage. For immediate protection, administrators should ensure that firmware is updated to the latest version provided by Contec, as vendors often release patches addressing these specific flaws in subsequent releases. Until a patch is available, restricting access to the management interface through IP whitelisting and enforcing strong multi-factor authentication can reduce the attack surface significantly.