The in its pages. An attacker can then insert

The
fundamental way of attack involves insertion of code

into
user input and enter into the data when SQL commands

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is
executed. This malicious data is in the form of string that

are
designed for storage in a table or as meta data. When a

stored
string is concatenated into a dynamically SQL command

the
malicious code is executed. Then attackers can read the

data
and any modification can done in data. An application is

vulnerable
when it takes untrusted data and send it to a web

browser
without any proper verification. Sometimes, malicious

user
use the blog site comment form to inserts and store

the
malicious script into database. Then an authorized user

sends
an HTTP request to site for viewing the latest comment.

Then
site returns the stored comment along with the scripts

in
its response. Finally the authorized user execute the script

code
and sends to an attacker server. These vulnerabilities

occurs
due to improper validation of user input by the server

side
program2,1. Mostly application are not implemented the

correctly
function for verification, then it allows the attackers

to
used the password and other information. When an attackers

can
get any sensitive information or functionality without any

proper
verification, it is termed as poor authentication.

Cross
site-scripting as one of the most serious vulnerabilities

in
web application. Where in attackers can execute malicious

scripts
in authorized website or web application.Different

static
and dynamic method are introduce to detect XSS vulnerabilities.

vulnerabilities
are detect through static analysis

without
executing the source code because various techniques

are
predefined in it. static technique are easy to implement but

it
produce too many false result. However dynamic analysis are

difficult
to implement but it generate mostly positive result8.

Attackers
does not attack the target user directly they send

the
malicious with in the web application that the victim user

visit.
They nd the way that the user visit it and offer charge

by
user to visit it. in order for an XSS attack to take place

the
vulnerable website needs to directly include user input in

its
pages. An attacker can then insert a string that will be

used
within the web page and treated as code by the victims

browser7.
In web application some resources like password,

identity
and information are keep protected by secret key or

value.