A New Approach to Detecting Dangerous DOM Injections Using Data Science Tools

The DOM provides developers with flexible and powerful tools for real-time page content manipulation. However, this flexibility also becomes a vulnerability — the interface can be exploited in unintended ways.
DOM injections are a type of client-side attack in which malicious code is injected directly into the page structure on the user's side. The script runs in the browser, intercepts actions, accesses data, and alters interface behavior — all without interacting with the server or triggering traditional security tools.
Attackers continue to refine their methods, while conventional security measures are losing effectiveness. Here’s why:
Most web products use dozens of external scripts loaded from various CDNs. This opens the door to injection attacks: malicious code is injected into obscure dependencies and remains unnoticed. Traditional signature-based tools fail to detect the majority of such attacks.
Modern attacks rarely use straightforward script injections. Instead, malicious code is embedded into legitimate frameworks or only activates under specific user actions. These scenarios bypass static rules and render template-based detection ineffective.
Domain blacklists, offline scanners, and both static and most dynamic rules are unable to detect threats forming in real time. Modern attacks dynamically assemble their codebase inside the browser. By the time protection systems see it — the incident has usually already occurred.
To counter these threats, we developed DTS (Direct & Correlated Detection System) — a hybrid solution combining deep DOM monitoring with behavioral session analysis in real time.
We monitor critical DOM API calls — such as appendChild, setAttribute, eval — and detect deviations from legitimate behavior patterns. This enables early identification of suspicious page structure modifications before they affect users.
DOM injections don’t occur in a vacuum. Data science tools help us analyze the full session behavior in detail:
In the upcoming API17+ release, we will introduce:
DOM injections are a form of attack that largely evade traditional security solutions. JuicyScore offers a different approach: dynamic behavioral analysis combined with deep client-side inspection. This method enables early-stage threat detection and damage prevention — before it happens.
If your web application relies on third-party scripts, now is the time to upgrade your web protection strategy.
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