{"action":"Upgrade firefox-esr to 78.5.0esr-1 or later.","affected":[{"fixed":"78.5.0esr-1","introduced":"0"}],"component":"firefox-esr","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["78.5.0esr-1"],"id":"tcs_01M5NEXK9R20B1S56EY7J3BCFN","modified_at":"2026-09-11T11:02:31.486004045Z","published_at":"2020-12-09T01:15:13.080Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2020-26958","https://security-tracker.debian.org/tracker/CVE-2020-26958"],"severity":{"label":"medium","score":6.1},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2020-26958","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2020-26958"}],"summary":"Firefox did not block execution of scripts with incorrect MIME types when the response was intercepted and cached through a ServiceWorker. This could lead to a cross-site script inclusion vulnerabilit"}