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LABORATORY CORE • Web Attacks

Cross-Site Scripting: Stored XSS Payload Injection

LOGGED UNSOLVED
VULNERABILITY BACKGROUND SCHEMA

Scenario Background

Exploit standard guestbook comment elements vulnerable to Stored Cross-Site Scripting. Deliver fully structured script triggers inside simulated user client headers and extract cookies payloads.

Lab Objectives

1

Locate weak input sanitized message fields inside dynamic apps

2

Construct executable Javascript payload injections

3

Bypass browser protections and manipulate storage variables

4

Retrieve administrative authentication flags via cookies simulation

SUBMIT EVIDENCE CTF FLAG

UNIX CONTAINER TERMINAL SANDBOX
LIVE TARGET: PORTAL:80
Console: vfs_active
guest@vulnarex:~$
http://securenode-intel.local/guestbook
Dynamic DOM Message Feed
@support_botNo. 1
Welcome to Vulnarex Live Guestbook module!
@analyst_alphaNo. 2
Our test suite elements are running stable. Sanitization filters pending.
HTML is parsed live in DOM tree