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If the trusted site is vulnerable to the vector, clicking the link can cause the victim's browser to execute the injected script.The persistent (or stored) XSS vulnerability is a more devastating variant of a cross-site scripting flaw: it occurs when the data provided by the attacker is saved by the server, and then permanently displayed on "normal" pages returned to other users in the course of regular browsing, without proper HTML escaping.This essentially states that if content from one site (such as https://mybank.example1.com) is granted permission to access resources on a system, then any content from that site will share these permissions, while content from another site (https://othersite.example2.com) will have to be granted permissions separately.Cross-site scripting attacks use known vulnerabilities in web-based applications, their servers, or the plug-in systems on which they rely.Some sources further divide these two groups into traditional (caused by server-side code flaws) and DOM-based (in client-side code).These holes show up when the data provided by a web client, most commonly in HTTP query parameters (e.g.Although widely recommended, performing HTML entity encoding only on the five XML significant characters is not always sufficient to prevent many forms of XSS attacks.

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The bait is an innocent-looking URL, pointing to a trusted site but containing the XSS vector.

Exploiting one of these, attackers fold malicious content into the content being delivered from the compromised site.

When the resulting combined content arrives at the client-side web browser, it has all been delivered from the trusted source, and thus operates under the permissions granted to that system.

A cross-site scripting vulnerability may be used by attackers to bypass access controls such as the same-origin policy.

Cross-site scripting carried out on websites accounted for roughly 84% of all security vulnerabilities documented by Symantec as of 2007.

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