Catalog/VULNERABILITY/xss
SCAN-ID: XSSREVISION 2026.4
VULNERABILITYCVSS 8.2 (HIGH)

Cross-Site Scripting (XSS) Scanner

Find XSS vulnerabilities that could let attackers inject malicious scripts and steal customer sessions.

Technical Scope & Verification Behavior

Inspects reflected parameters, DOM script sinks (innerHTML, eval, document.write), polyglot SVG attributes, and missing output encodings.

Automated Inspection Checks (16)
Passive URL parameter fuzzing
Non-destructive boundary tests
Header & cookie flag assertions
Differential latency timing

Proof of Concept (PoC) Vector

Canonical test payload dispatched during security surface audits.

"><svg/onload=alert(document.cookie)>

Probe Execution Simulator

Watch the probe engine test this signature in an isolated sandbox.

probe-runner (isolated ephemeral container)
Click 'Simulate Check' to watch the headless audit engine test this vector.

Remediation Patch

Safe DOM Injection

patch.diff (tsx)
--- a/handler.tsx (Vulnerable)
<div dangerouslySetInnerHTML={{ __html: userBio }} />
+++ b/handler.tsx (Remediated)
<div>{DOMPurify.sanitize(userBio)}</div>

Always sanitize dynamic HTML with DOMPurify or let React escape text nodes automatically.

AI Agent Prompt (Cursor · Claude · Copilot)

Copy and paste into your editor to refactor this issue automatically.

"Sanitize userBio input before rendering by installing DOMPurify or using standard text elements without dangerouslySetInnerHTML."

Run Isolated Check

Test your public domain specifically for Cross-Site Scripting (XSS) Scanner.

100% passive • No server load

Specification Details

CVSS Score
8.2 / 10.0
Severity Level
HIGH
Category
VULNERABILITY
Test Vectors
16 automated
Execution SLA
< 2.5 seconds
False Positive Defense
Strict assertion
Related Standards
#OWASP A03#Client-Side#XSS#DOM

Run continuous monitoring for Cross-Site Scripting (XSS) Scanner

Audit your site across all 41 vectors automatically on every deploy.

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