21/03/2026
Welcome to AUSSEC Cyber Saturday's where I highlight everything from exploits, defence and general knowledge. In todays episode i'd like to draw your attention to something a lot of dev's get wrong with their code - Dear devworld SANITISE your JS pls k thx
🔥 DOM XSS — The Most UNDERRATED Web Attack 🔥
Everyone talks about Stored & Reflected XSS…
But the real silent killer? 👇
👉 DOM-Based XSS
💀 No server logs
💀 No WAF alerts
💀 Happens inside the browser
💀 Devs don’t even notice it
🧠 How it works?
The browser itself becomes the victim.
JavaScript takes user input → directly injects into DOM → BOOM 💥
document.write(location.search)
👆 That’s all an attacker needs.
🎯 Payload?
Just open a link like this:
?search=alert('HACKED')
⚠️ Script executes instantly — no backend involved.
🚨 Why hackers LOVE it:
✔️ Stealthy (no logs)
✔️ Easy to exploit
✔️ Hard to detect
✔️ Works on “secure” apps
💣 Impact:
Session hijacking
Account takeover
Keylogging
Full UI control
🧠 Golden Rule:
👉 If JavaScript touches user input without sanitization = XSS
🔥 Final Thought:
DOM XSS is not weak…
It’s just ignored.
