{"action":"Upgrade thunderbird to 1:91.4.0-1 or later.","affected":[{"fixed":"1:91.4.0-1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["1:91.4.0-1"],"id":"tcs_01M5NG1K2TFR151FSA9BKGS6AF","modified_at":"2026-10-23T18:04:16.805333857Z","published_at":"2021-12-08T22:15:09.677Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-43538","https://security-tracker.debian.org/tracker/CVE-2021-43538"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-43538#Debian:13/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-43538"}],"summary":"By misusing a race in our notification code, an attacker could have forcefully hidden the notification for pages that had received full screen and pointer lock access, which could have been used for s"}