{"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:13","exploited":false,"fixed_versions":["91.3.0esr-1"],"id":"tcs_01M5NFX5VC6BXJEDC7BBP471Q4","modified_at":"2026-10-23T18:03:46.025014328Z","published_at":"2021-12-08T22:15:09.050Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-38509","https://security-tracker.debian.org/tracker/CVE-2021-38509"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-38509#Debian:13/firefox-esr","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-38509"}],"summary":"Due to an unusual sequence of attacker-controlled events, a Javascript alert() dialog with arbitrary (although unstyled) contents could be displayed over top an uncontrolled webpage of the attacker's"}