CVE-2026-1971 Overview
A cross-site scripting (XSS) vulnerability has been identified in the Edimax BR-6288ACL wireless router firmware up to version 1.12. The vulnerability exists in the wiz_WISP24gmanual function within the wiz_WISP24gmanual.asp file. An attacker with administrative privileges can exploit this vulnerability by manipulating the manualssid argument, allowing injection of malicious scripts that execute in the context of a victim's browser session.
Critical Impact
This vulnerability enables authenticated attackers to inject malicious scripts through the router's web interface, potentially leading to session hijacking, credential theft, or unauthorized administrative actions. The affected product is end-of-life (EOL) and no longer supported by the vendor.
Affected Products
- Edimax BR-6288ACL firmware versions up to and including 1.12
Discovery Timeline
- February 6, 2026 - CVE-2026-1971 published to NVD
- February 6, 2026 - Last updated in NVD database
Technical Details for CVE-2026-1971
Vulnerability Analysis
The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting. The flaw resides in the wiz_WISP24gmanual.asp file, specifically within the wiz_WISP24gmanual function that handles WISP (Wireless Internet Service Provider) configuration for the 2.4GHz band.
When processing the manualssid parameter, the application fails to properly sanitize user-supplied input before rendering it in the web page output. This allows an authenticated attacker with high privileges to inject arbitrary JavaScript code that executes when a user views the affected page. While the attack requires administrative access and user interaction, the network-accessible nature of the router's management interface increases the potential attack surface.
Root Cause
The root cause is improper input validation and output encoding in the wiz_WISP24gmanual.asp web interface file. The manualssid parameter accepts user input intended for wireless network SSID configuration but does not implement adequate sanitization or encoding mechanisms. When this unsanitized input is reflected in the HTML response, any embedded JavaScript code is executed by the victim's browser.
Attack Vector
The attack can be launched remotely over the network by an authenticated attacker with administrative privileges on the router. The attacker crafts a malicious value for the manualssid parameter containing JavaScript payload. When an administrator or another user with access to the configuration interface views the affected page, the injected script executes in their browser context.
The exploitation scenario typically involves:
- Attacker gains administrative access to the router's web interface
- Attacker navigates to the WISP 2.4GHz manual configuration page
- Attacker injects a malicious JavaScript payload into the manualssid field
- The payload is stored or reflected and executes when the page is rendered
- The malicious script can steal session cookies, redirect users, or perform actions on behalf of the victim
For detailed technical information, refer to the Notion Vulnerability Report.
Detection Methods for CVE-2026-1971
Indicators of Compromise
- Unexpected JavaScript code or HTML tags present in the manualssid configuration field
- Anomalous HTTP requests to wiz_WISP24gmanual.asp containing script tags or encoded JavaScript
- Unusual administrative session activity or unexplained configuration changes
- Browser console errors or unexpected redirects when accessing router configuration pages
Detection Strategies
- Monitor HTTP traffic to the router's management interface for suspicious payloads in the manualssid parameter
- Implement web application firewall (WAF) rules to detect and block XSS attack patterns in requests to the router
- Review router configuration exports for unexpected content in wireless SSID settings
- Deploy network intrusion detection systems (IDS) with signatures for common XSS payloads
Monitoring Recommendations
- Enable and regularly review access logs for the router's web management interface
- Set up alerts for multiple failed authentication attempts followed by successful login
- Monitor for configuration changes made outside of authorized change windows
- Implement session monitoring to detect potential session hijacking attempts
How to Mitigate CVE-2026-1971
Immediate Actions Required
- Restrict access to the router's web management interface to trusted networks or specific IP addresses only
- Disable remote management access if not strictly required
- Consider replacing the end-of-life Edimax BR-6288ACL with a currently supported router model
- Ensure administrative credentials are strong and unique
Patch Information
No security patch is available for this vulnerability. The vendor, Edimax, has confirmed that the BR-6288ACL is an end-of-life product that is no longer supported. Edimax has indicated they "will issue a consolidated Security Advisory on our official support website." Organizations using this device should plan for immediate replacement with a supported product.
Additional information is available through VulDB #344493.
Workarounds
- Disable the web-based management interface entirely and use alternative management methods if available
- Implement network segmentation to isolate the router's management interface from untrusted networks
- Use a VPN or jump host to access the router's management interface, limiting direct network exposure
- Deploy a reverse proxy with XSS filtering capabilities in front of the management interface if direct access cannot be restricted
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
