CVE-2026-1744
Unknown Unknown - Not Provided
Cross-Site Scripting in D-Link DSL-6641K PPPoE Function

Publication date: 2026-02-02

Last updated on: 2026-04-29

Assigner: VulDB

Description
A vulnerability was found in D-Link DSL-6641K N8.TR069.20131126. Affected by this issue is the function doSubmitPPP of the file sp_pppoe_user.js. The manipulation of the argument Username results in cross site scripting. The attack may be launched remotely. The exploit has been made public and could be used. This vulnerability only affects products that are no longer supported by the maintainer.
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Meta Information
Published
2026-02-02
Last Modified
2026-04-29
Generated
2026-06-16
AI Q&A
2026-02-02
EPSS Evaluated
2026-06-14
NVD
CVE-2026-1744
EUVD
EUVD-2026-5152
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
dlink dsl-6641k_firmware n8.tr069.20131126
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CWE-94 The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.
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Executive Summary

CVE-2026-1744 is a stored cross-site scripting (XSS) vulnerability in the D-Link DSL-6641K router, specifically in the function doSubmitPPP within the sp_pppoe_user.js file. The vulnerability occurs because the Username argument is not properly sanitized or encoded, allowing an attacker to inject malicious JavaScript code. This malicious script is stored in the router's configuration and executed when the configuration is accessed, potentially compromising the integrity of the system. Exploitation requires remote access with elevated privileges and some user interaction. [1, 2]

Impact Analysis

This vulnerability can impact you by allowing an attacker to inject and execute malicious scripts in the context of your browser when interacting with the affected router's configuration interface. This could lead to unauthorized actions or manipulation of the router's settings, potentially compromising the device's integrity. However, exploitation requires elevated privileges and some user interaction, and the affected products are no longer supported, meaning no official fixes are available. [1, 2]

Detection Guidance

This vulnerability can be detected by inspecting the Username field in the PPPoE configuration form of the D-Link DSL-6641K router for malicious JavaScript code injections. Since the vulnerability is a stored cross-site scripting (XSS) in the sp_pppoe_user.js file's doSubmitPPP function, you can check the router's configuration for suspicious script tags or JavaScript code embedded in the Username field. There are no specific commands provided for detection, but manual inspection of the router's web interface or configuration files for script injections in the Username parameter is recommended. [1, 2]

Mitigation Strategies

Immediate mitigation steps include replacing the affected D-Link DSL-6641K router with a supported device, as no known countermeasures or mitigations have been identified for this vulnerability. Since the product is no longer supported by the maintainer and the vulnerability allows remote exploitation, discontinuing use of the affected device is recommended to prevent exploitation. [1]

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