# Attack Scenario Notes

## Overview

`CVE-2026-36226` describes a cross-site scripting vulnerability in Advantech WebAccess/SCADA 8.0-2015.08.16. The affected location is the Admin Dashboard Create New Project User component, specifically the `decryption` field.

## Affected Pattern

1. A remote attacker reaches the WebAccess/SCADA Admin Dashboard workflow.
2. The attacker supplies JavaScript-bearing input in the `decryption` field.
3. The application stores or reflects the field value.
4. A victim user views the affected page or record.
5. The browser executes attacker-controlled JavaScript in the WebAccess/SCADA origin.

## Benign Verification Payload

```html
"><svg/onload=alert("CVE-2026-36226")>
```

The public PoC does not include credential theft, cookie exfiltration, or destructive JavaScript.

## Impact Assessment

The primary impact is browser-side JavaScript execution in the context of the affected WebAccess/SCADA application. Depending on deployment and privileges, XSS can support:

- Sensitive information disclosure.
- Session hijacking where cookies or tokens are accessible.
- Actions performed as the victim user.
- UI redress or phishing within the trusted application origin.

Suggested CVSS-style framing:

- High if the XSS is stored and triggers for privileged users.
- Medium if exploitation requires authentication and user interaction.
- Low/Medium if the payload is only self-XSS or requires administrator-only input with no victim path.

## Defensive Guidance

- Apply context-aware output encoding.
- Validate and constrain `decryption` field input.
- Use templating APIs that escape by default.
- Deploy Content Security Policy.
- Use `HttpOnly`, `Secure`, and `SameSite` cookie flags.
- Audit similar Admin Dashboard fields for the same rendering pattern.