CVE-2026-7001: Datacom DM4100 XSS Vulnerability

CVE-2026-7001 Overview

A Cross-Site Scripting (XSS) vulnerability has been identified in the Datacom DM4100 network device firmware version 1.3.6.1.4.1.3709. The vulnerability exists within the Ethernet Configuration Page component, where improper sanitization of the Name argument allows attackers to inject malicious scripts. This flaw can be exploited remotely by authenticated users with high privileges, potentially enabling session hijacking, credential theft, or unauthorized actions within the device management interface.

Critical Impact

Authenticated attackers can inject malicious scripts through the Ethernet Configuration Page, potentially compromising administrator sessions and enabling further attacks against network infrastructure.

Affected Products

• Datacom DM4100 firmware version 1.3.6.1.4.1.3709
• Datacom DM4100 Ethernet Configuration Page component

Discovery Timeline

• 2026-04-25 - CVE-2026-7001 published to NVD
• 2026-04-29 - Last updated in NVD database

Technical Details for CVE-2026-7001

Vulnerability Analysis

This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting (XSS). The flaw resides in the Ethernet Configuration Page of the Datacom DM4100 device's web management interface. When administrators configure network settings, the Name parameter does not undergo proper input validation or output encoding before being rendered in the browser.

The attack requires network access and authenticated privileges to exploit. An attacker with administrative access could inject JavaScript code through the Name field, which would then execute in the context of other administrators' browser sessions when they view the configuration page. This stored XSS variant poses risks including session token theft, phishing attacks within the management interface, and potential lateral movement to other network devices.

The vendor was contacted regarding this vulnerability but did not respond, leaving users without an official patch or mitigation guidance. The exploit details have been made public, increasing the urgency for defensive measures.

Root Cause

The root cause is insufficient input validation and output encoding in the Datacom DM4100 web interface. The Ethernet Configuration Page fails to sanitize user-supplied data in the Name parameter before storing it in the device configuration and subsequently rendering it to the browser. This allows HTML and JavaScript content to be injected and executed within the trusted context of the device management interface.

Attack Vector

The attack is conducted over the network, targeting the web management interface of the Datacom DM4100 device. An attacker with high-level privileges (such as an administrative account) can manipulate the Name argument within the Ethernet Configuration Page to inject malicious script content. The attack requires some user interaction, as a victim administrator must view the affected configuration page for the injected script to execute. Once triggered, the malicious payload runs with the full privileges of the victim's browser session within the management interface.

The exploitation path involves crafting a malicious input containing JavaScript code and submitting it through the Ethernet Configuration Page's Name field. When other administrators access this page, the unsanitized content is rendered directly in their browsers, executing the attacker's payload.

Detection Methods for CVE-2026-7001

Indicators of Compromise

• Unusual JavaScript code or HTML tags present in device configuration exports, particularly in network interface name fields
• Unexpected HTTP requests originating from administrator browsers to external domains after accessing the Ethernet Configuration Page
• Configuration changes containing encoded script payloads such as <script>, javascript:, or event handlers like onerror

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block XSS payloads in requests to the DM4100 management interface
• Monitor access logs for the Ethernet Configuration Page, particularly POST requests with suspicious patterns in the Name parameter
• Enable browser security features like Content Security Policy (CSP) headers at the network perimeter if the device doesn't support them natively

Monitoring Recommendations

• Audit all administrative access to Datacom DM4100 devices and review configuration change logs for anomalous entries
• Configure network monitoring to alert on suspicious outbound connections from administrator workstations after accessing device management interfaces
• Regularly export and review device configurations for evidence of injected script content in configuration fields

How to Mitigate CVE-2026-7001

Immediate Actions Required

• Restrict access to the Datacom DM4100 web management interface to trusted networks and IP addresses only
• Implement additional network segmentation to isolate device management interfaces from general user networks
• Review and audit existing device configurations for evidence of injected malicious content
• Consider disabling web-based management and using alternative configuration methods if available

Patch Information

No official patch is currently available from the vendor. According to the vulnerability disclosure, the vendor was contacted about this issue but did not respond. Users should monitor the VulDB entry and vendor communications for any future security updates.

Organizations should evaluate the risk of continued use of affected devices and consider replacement options if the vulnerability cannot be adequately mitigated through compensating controls.

Workarounds

• Place the DM4100 management interface behind a reverse proxy with input filtering capabilities to sanitize potentially malicious inputs before they reach the device
• Implement strict access controls limiting administrative access to the minimum number of trusted personnel necessary
• Use dedicated management workstations with enhanced browser security settings and script-blocking extensions when accessing the device interface
• Configure network-level access control lists (ACLs) to restrict management interface access to specific administrator IP addresses

# Example network access restriction (firewall rule)
# Restrict access to DM4100 management interface (port 443/80) to trusted admin network only
iptables -A INPUT -p tcp --dport 443 -s 10.0.100.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
iptables -A INPUT -p tcp --dport 80 -s 10.0.100.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP