{"action":"Upgrade firefox-esr to 78.9.0esr-1 or later.","affected":[{"fixed":"78.9.0esr-1","introduced":"0"}],"component":"firefox-esr","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["78.9.0esr-1"],"id":"tcs_01M5NFFDN4HYFF27HRRM27853T","modified_at":"2026-10-23T18:03:25.477942664Z","published_at":"2021-03-31T14:15:19.170Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-23984","https://security-tracker.debian.org/tracker/CVE-2021-23984"],"severity":{"label":"medium","score":6.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-23984#Debian:13/firefox-esr","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-23984"}],"summary":"A malicious extension could have opened a popup window lacking an address bar. The title of the popup lacking an address bar should not be fully controllable, but in this situation was. This could hav"}