In theory and practice, there are indeed technical solutions that use web pages to inject malicious scripts, attempting to obtain device information without the user's knowledge or even authorization. Such technologies are usually related to the following vulnerabilities or attack methods: 1. Cross-site scripting (XSS): - The attacker injects malicious code into the web page so that the user who visits the page executes the code in his browser environment. - Using XSS, malicious scripts may steal the user's cookies, session identifiers or other sensitive information, and then hijack the user's identity or session. In addition, malicious scripts may also be used to collect information such as device fingerprints, thereby understanding the configuration or environment of the victim's device to a certain extent. 2. Cross-site request forgery (CSRF): - Although CSRF is mainly used to initiate malicious requests without the user's knowledge, if combined with other technical means, it may also assist attackers in obtaining user information or further data collection on the device. 3. Browser fingerprinting and side channel attacks: - When the malicious script runs on the user's device, it may use data such as browser behavior, plug-in information, hardware configuration, etc. to perform so-called "fingerprinting". This technology can map the characteristics of the user's device to a certain extent, thereby helping attackers identify the same device in multiple access scenarios. It should be noted that most modern browsers and website development frameworks have already taken many preventive measures against this type of attack: • Input validation and output encoding: prevent malicious code from entering the page through untrusted input. • Content Security Policy (CSP): reduce the risk of malicious script injection by limiting the source of scripts that can be executed in the web page. • Same-Origin Policy: restricts the script's access to resources in other domains, making it difficult for attackers to directly obtain all the information on the user's device. In addition, once these technologies are used to obtain information without authorization, it not only violates network security regulations, but is also illegal in most countries and regions. Professional security research usually tests and fixes these vulnerabilities within the scope of clear authorization and legal permission, thereby helping to improve the overall level of network security. In summary, although there are indeed some technical means to use web pages to implant malicious scripts to try to obtain user device information, the protection measures against these means in the modern Internet environment have greatly reduced their practical feasibility, and any unauthorized use is illegal. The purpose of understanding these technologies should be to help strengthen security protection, rather than for illegal attacks.