> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/web/cors/cors-with-trusted-insecure-protocols.md).
# CORS with Trusted Insecure Protocols
CORS with Trusted Insecure Protocols notes for PortSwigger Web Security Academy labs, including exploitation workflow, payload testing, Burp Suite validation, and remediation context.
### CORS Vulnerability with Trusted Insecure Protocols
The site has a vulnerable CORS configuration: it trusts all **subdomains**, even when using **HTTP**. The goal is to retrieve the administrator's API key via CORS and to extract it to the operating server.
Provided credentials: `wiener:peter`.The site has a vulnerable CORS configuration: it trusts all **subdomains**, even when using **HTTP**. The goal is to retrieve the administrator's API key via CORS and to extract it to the operating server.
Provided credentials: `wiener:peter`.
#### Observations
* The root domain is accepted in **HTTP**:
{% code overflow="wrap" %}
```html
Origin: http://0a550036047e216980caa86b00fb0073.web-security-academy.net
```
{% endcode %}
**Subdomains** in HTTP are also accepted:
{% code overflow="wrap" %}
```
Origin: http://jord4n.0a550036047e216980caa86b00fb0073.web-security-academy.net
```
{% endcode %}
Sub-domain identified via stockcheck:
{% code overflow="wrap" %}
```html
https://stock.0a550036047e216980caa86b00fb0073.web-security-academy.net/?productId=1&storeId=1
```
{% endcode %}
This item reflects `productId` → \*\* HTML/JS\*\* injection possible:
```html
?productId=test&storeId=1
```
```html
?productId=
hello
&storeId=1
?productId=&storeId=1
```
#### Exploitation: Reading `/accountDetails` and Exfiltration
XHR Script used (sent via subdomain):
```javascript
```
Inject script into the `productId` parameter of the vulnerable subdomain:
```javascript
https://stock.0a550036047e216980caa86b00fb0073.web-security-academy.net/?productId=&storeId=1
```
Redirect to the URL to exploit with the `apiKey` variable containing the encoded response.
#### Payload Sent to Victim (URL-encoded Version)
```javascript
```
* Receiving API key on the server to exploit via the `apiKey` parameter.
* Decoding performed with:
```bash
echo -n "ewogICJ1c2VybmFtZSI6ICJhZG1pbmlzdHJhdG9yIiwKICAiZW1haWwiOiAiIiwKICAiYXBpa2V5IjogIllUY0ViOFFLb3F1SE90MTJ4bGt1M1ZoYTlFNk0wbDJIIiwKICAic2Vzc2lvbnMiOiBbCiAgICAiZ25yTGM2UDVEb01uQmxyUTczQ3l6SldBUnJzTXJpYlciCiAgXQp9" | base64 -d
```
---
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