CVE-2017-7823 | Mozilla Firefox up to 55 CSP cross site scripting (MFSA 2017-21 / Nessus ID 108820)
A vulnerability, which was classified as critical, was found in Mozilla Firefox up to 55. Affected by this issue is some unknown functionality of the component CSP. Such manipulation leads to cross site scripting.
This vulnerability is listed as CVE-2017-7823. The attack may be performed from remote. There is no available exploit.
You should upgrade the affected component.