Burp Sequencer is a tool for analyzing the quality of randomness in a sample of data items. You can use it to test an application's session tokens or other important data items that are intended to be unpredictable, such as anti-CSRF tokens, password reset tokens, etc.
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This release adds a new Scanner check for path-relative style sheet import (PRSSI) vulnerabilities.
These issues are not widely understood by security testers or application developers, and real vulnerabilities are quite prevalent in the wild. The impact of the vulnerability is in many cases serious, and equivalent to cross-site scripting (XSS).