CVE-2026-6995 Overview
A Cross-Site Scripting (XSS) vulnerability has been identified in BDCOM P3310D firmware version 0.4.2 10.1.0F Build 86345. The vulnerability exists within the /index.asp file associated with the New User Page component. Improper input sanitization of the User name argument allows attackers to inject malicious scripts that execute in the context of other users' browser sessions. The attack can be initiated remotely over the network, though it requires high privileges and user interaction to successfully exploit.
Critical Impact
This XSS vulnerability in the BDCOM P3310D device's web management interface allows remote attackers to inject malicious scripts through the username field, potentially compromising administrative sessions and enabling further attacks on network infrastructure.
Affected Products
- BDCOM P3310D Firmware 0.4.2 10.1.0F Build 86345
Discovery Timeline
- 2026-04-25 - CVE-2026-6995 published to NVD
- 2026-04-29 - Last updated in NVD database
Technical Details for CVE-2026-6995
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 web-based management interface of the BDCOM P3310D device, specifically in the New User Page functionality.
The vulnerability allows attackers to inject arbitrary JavaScript or HTML content through the User name field on the /index.asp page. When a victim (typically an administrator) views the manipulated content, the malicious script executes within their browser context, potentially allowing session hijacking, credential theft, or unauthorized actions on the device.
According to public disclosure information, the exploit has been released publicly and may be used for malicious purposes. The vendor was contacted about this vulnerability but did not respond, leaving affected devices without an official patch.
Root Cause
The root cause of this vulnerability is insufficient input validation and output encoding in the New User Page component. The application fails to properly sanitize user-supplied input in the User name parameter before rendering it in the web interface. This allows specially crafted input containing script tags or JavaScript event handlers to be stored and later executed when the page is rendered.
Attack Vector
The attack can be performed remotely over the network by an authenticated attacker with high privileges. The exploitation requires user interaction—specifically, a victim must access the page containing the injected malicious content. Once triggered, the malicious script executes within the victim's browser session with full access to the device's web management interface context.
The attacker would typically craft a malicious username containing JavaScript code, which gets stored in the system. When an administrator views or manages users through the web interface, the injected script executes, potentially allowing the attacker to steal session cookies, perform actions on behalf of the administrator, or redirect users to malicious sites.
Detection Methods for CVE-2026-6995
Indicators of Compromise
- Unusual or suspicious entries in the user database containing script tags, event handlers, or encoded JavaScript
- Web server logs showing requests to /index.asp with encoded or obfuscated payloads in the username parameter
- Administrator reports of unexpected browser behavior when accessing the New User Page
Detection Strategies
- Implement web application firewall (WAF) rules to detect XSS payloads in form submissions targeting /index.asp
- Monitor authentication logs for newly created users with suspicious usernames containing special characters such as <, >, script, or onerror
- Deploy browser-based security tools that can detect and block XSS execution attempts
Monitoring Recommendations
- Enable detailed logging on the BDCOM P3310D device to capture all user management activities
- Set up alerts for user creation events with usernames containing HTML or JavaScript syntax patterns
- Regularly review user accounts on affected devices for anomalous entries
How to Mitigate CVE-2026-6995
Immediate Actions Required
- Restrict access to the device's web management interface to trusted networks only using firewall rules or ACLs
- Limit the number of users with administrative access to the BDCOM P3310D device
- Consider disabling the web management interface if not required and use alternative management methods such as CLI over SSH
- Implement network segmentation to isolate affected devices from critical infrastructure
Patch Information
No official patch is currently available from BDCOM. According to the vulnerability disclosure, the vendor was contacted but did not respond. Organizations using affected devices should monitor BDCOM's official channels for any future security updates. For additional technical details, refer to the VulDB Vulnerability Entry.
Workarounds
- Deploy a reverse proxy or WAF in front of the device's web interface configured to sanitize or block XSS payloads
- Implement strict content security policies (CSP) at the network level if supported by intermediary devices
- Use browser extensions that provide XSS protection when accessing the device management interface
- Consider replacing affected devices with alternatives from vendors with better security response practices
# Example: Restrict web management access using iptables
# Allow management access only from trusted admin network
iptables -A INPUT -p tcp --dport 80 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
