An attacker targeting an authenticated user can push him to click on a URL of FusionPBX 4.5.7 specially crafted to get javascript code executed in his browser.
In FusionPBX up to v4.5.7, file app\contacts\contact_edit.php uses an unsanitized “query_string” variable coming from the URL which is reflected in HTML leading to XSS.
Bug ID: https://www.fusionpbx.com/app/tickets/ticket_edit.php?id=c76ef65c-3df5-48cc-8c63-01e3325564f4
Fix: https://github.com/fusionpbx/fusionpbx/commit/cc820b2eb12a3b7070afdcb7f977f70a1d49ce49
Issue was reported on 10/08/2019 by Pierre Jourdan and fixed on 13/08/2019 on 4.4 and Master branches by Mark J Crane.
CVE published, NVD base score is 6.1 MEDIUM:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-16973
https://nvd.nist.gov/vuln/detail/CVE-2019-16973
