{"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_01M5NFX2CNJK2STHAHQ8Z1BXJ9","modified_at":"2026-10-23T18:03:31.945303526Z","published_at":"2021-12-08T22:15:08.737Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-38503","https://security-tracker.debian.org/tracker/CVE-2021-38503"],"severity":{"label":"critical","score":10},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-38503#Debian:13/firefox-esr","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-38503"}],"summary":"The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass restrictions such as executing scripts or navigating the top-level frame. This vulnerability affec"}