A duplicate SystemPrincipal object could be created when parsing a non-system html document via DOMParser::ParseFromSafeString. This could have lead to bypassing web security checks. This vulnerability affects Firefox < 109.
SystemPrincipal
DOMParser::ParseFromSafeString
[ { "events": [ { "introduced": "0" }, { "fixed": "109.0" } ] } ]
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-23604.json"