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Cross-site scripting (XSS) [a] is a type of security vulnerability that can be found in some web applications.XSS attacks enable attackers to inject client-side scripts into web pages viewed by other users.
Double URI-encoding, also referred to as double percent-encoding, is a special type of double encoding in which data is URI-encoded twice in a row. [6] In other words, double-URI-encoded form of data X is URI-encode(URI-encode(X)). [7]
Graph showing the progress of the XSS worm that impacted 2525 users on Justin.tv Justin.tv was a video casting website with an active user base of approximately 20 thousand users. The cross-site scripting vulnerability that was exploited was that the "Location" profile field was not properly sanitized before its inclusion in a profile page.
Samy (also known as JS.Spacehero) is a cross-site scripting worm that was designed to propagate across the social networking site MySpace by Samy Kamkar.Within just 20 hours [1] of its October 4, 2005 release, over one million users had run the payload [2] making Samy the fastest-spreading virus of all time.
Self-XSS (self cross-site scripting) is a type of security vulnerability used to gain control of victims' web accounts. In a Self-XSS attack, the victim of the attack runs malicious code in their own web browser, thus exposing personal information to the attacker.
Additionally, while typically described as a static type of attack, CSRF can also be dynamically constructed as part of a payload for a cross-site scripting attack, as demonstrated by the Samy worm, or constructed on the fly from session information leaked via offsite content and sent to a target as a malicious URL.
Must not be used in HTTP/2 [14] Upgrade: h2c, HTTPS/1.3, IRC/6.9, RTA/x11, websocket: Permanent RFC 9110: Vary: Tells downstream proxies how to match future request headers to decide whether the cached response can be used rather than requesting a fresh one from the origin server. Example 1: Vary: * Example 2: Vary: Accept-Language; Permanent ...
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