{"action":"Upgrade firefox-esr to 78.7.0esr-1 or later.","affected":[{"fixed":"78.7.0esr-1","introduced":"0"}],"component":"firefox-esr","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["78.7.0esr-1"],"id":"tcs_01M5NFF5R4KNATMC6YG8Y4W015","modified_at":"2026-10-23T18:02:52.203942281Z","published_at":"2021-02-26T03:15:13.433Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-23953","https://security-tracker.debian.org/tracker/CVE-2021-23953"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-23953#Debian:13/firefox-esr","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-23953"}],"summary":"If a user clicked into a specifically crafted PDF, the PDF reader could be confused into leaking cross-origin information, when said information is served as chunked data. This vulnerability affects F"}