{"action":"Upgrade firefox-esr to 140.8.0esr-1~deb13u1 or later.","affected":[{"fixed":"140.8.0esr-1~deb13u1","introduced":"0"}],"component":"firefox-esr","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["140.8.0esr-1~deb13u1"],"id":"tcs_01M5NRFKC4HAPBGANSQ178SAWG","modified_at":"2026-10-01T03:03:21.504080128Z","published_at":"2026-02-24T14:16:26.123Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-2777","https://security-tracker.debian.org/tracker/CVE-2026-2777"],"severity":{"label":"critical","score":9.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-2777#Debian:13/firefox-esr","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-2777"}],"summary":"Privilege escalation in the Messaging System component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8."}