{"action":"Upgrade firefox-esr to 91.3.0esr-1 or later.","affected":[{"fixed":"91.3.0esr-1","introduced":"0"}],"component":"firefox-esr","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["91.3.0esr-1"],"id":"tcs_01M5NFX3WXWANN7J5SABE5RFM6","modified_at":"2026-10-23T18:03:31.996798454Z","published_at":"2021-12-08T22:15:08.897Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-38506","https://security-tracker.debian.org/tracker/CVE-2021-38506"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-38506#Debian:14/firefox-esr","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-38506"}],"summary":"Through a series of navigations, Firefox could have entered fullscreen mode without notification or warning to the user. This could lead to spoofing attacks on the browser UI including phishing. This"}