<s>
In	O
web	O
security	O
,	O
cross-site	B-Protocol
tracing	I-Protocol
(	O
abbreviated	O
"	O
XST	O
"	O
)	O
is	O
a	O
network	O
security	O
vulnerability	O
exploiting	O
the	O
HTTP	B-Protocol
TRACE	O
method	O
.	O
</s>
<s>
XST	O
scripts	O
exploit	O
ActiveX	B-Application
,	O
Flash	B-Operating_System
,	O
or	O
any	O
other	O
controls	O
that	O
allow	O
executing	O
an	O
HTTP	B-Protocol
TRACE	O
request	O
.	O
</s>
<s>
The	O
HTTP	B-Protocol
TRACE	O
response	O
includes	O
all	O
the	O
HTTP	B-Protocol
headers	B-General_Concept
including	O
authentication	O
data	O
and	O
HTTP	B-Application
cookie	I-Application
contents	O
,	O
which	O
are	O
then	O
available	O
to	O
the	O
script	O
.	O
</s>
<s>
In	O
combination	O
with	O
cross	O
domain	O
access	O
flaws	O
in	O
web	B-Application
browsers	I-Application
,	O
the	O
exploit	O
is	O
able	O
to	O
collect	O
the	O
cached	O
credentials	O
of	O
any	O
web	O
site	O
,	O
including	O
those	O
utilizing	O
SSL	B-Protocol
.	O
</s>
