What this page helps you understand
XSS risk is easy to overstate if a scanner only sees reflection. Fixnx separates indicators, persistence, and browser execution so teams know what was actually proven.
What Fixnx checks
Input reflection
Stored marker persistence
DOM sinks
Browser execution signals
Context-aware evidence
Safe markers
XSS needs context, not just payload lists
A payload reflected into text is not the same as browser-side JavaScript execution. Treating them the same creates false confidence and noisy reports.
Fixnx uses confidence labels so stored-but-not-executed findings stay likely, while browser execution evidence is required for confirmed XSS.
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FAQ
Why is stored XSS sometimes marked likely?
If a marker is stored and retrieved but browser execution is not observed, Fixnx reports it as likely rather than confirmed.
What should developers fix first?
Fix confirmed execution first, then review persistent and reflected likely signals with output encoding and sanitization.