CVE-2021-23953 | Mozilla Firefox/Firefox ESR/Thunderbird PDF Reader cross-domain policy (Nessus ID 208628)
A vulnerability has been found in Mozilla Firefox, Firefox ESR and Thunderbird and classified as critical. This vulnerability affects unknown code of the component PDF Reader. The manipulation leads to permissive cross-domain policy with untrusted domains.
This vulnerability was named CVE-2021-23953. The attack can be initiated remotely. There is no exploit available.
It is recommended to upgrade the affected component.