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_urls.php uses an unsanitized “id” 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=94abcf04-9b03-46cd-8d2b-092e043579aa
Fix: https://github.com/fusionpbx/fusionpbx/commit/a76d9637e31a70060ecc38786246a8b1c9178322
Issue was reported by Pierre Jourdan on 10/08/2019 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-2019-16979
https://nvd.nist.gov/vuln/detail/CVE-2019-16979
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