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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.
Microsoft security-engineers introduced the term "cross-site scripting" in January 2000.
The expression "cross-site scripting" originally referred to the act of loading the attacked, third-party web application from an unrelated attack-site, in a manner that executes a fragment of Java Script prepared by the attacker in the security context of the targeted domain (taking advantage of a reflected or non-persistent XSS vulnerability).
A reflected attack is typically delivered via email or a neutral web site.
The bait is an innocent-looking URL, pointing to a trusted site but containing the XSS vector.
The UNI Gallery of Art, in partnership with Cedar Valley Chamber Music, will present a concert titled "L. Stories: Forgotten Composers of the Silver Screen." In addition, the gallery will offer a one-night-only art exhibition titled "In Sync: Objects from the UNI Permanent Art Collection." The concert and exhibition will take place in Kamerick Art Building (KAB) South at 7 p.m., Wednesday, July 18.
These holes show up when the data provided by a web client, most commonly in HTTP query parameters (e.g.
Security on the web depends on a variety of mechanisms, including an underlying concept of trust known as the same-origin policy.
This essentially states that if content from one site (such as https://mybank.example1.com) is granted permission to access resources (like cookies etc.) on a browser, then content from any URL with the same (1) URI scheme, (2) host name, and (3) port number will share these permissions.
By finding ways of injecting malicious scripts into web pages, an attacker can gain elevated access-privileges to sensitive page content, to session cookies, and to a variety of other information maintained by the browser on behalf of the user.
Cross-site scripting attacks are a case of code injection.