{"action":"No fix published. Pin and monitor.","affected":[{"introduced":"0"}],"component":"node-matrix-js-sdk","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:11","exploited":false,"fixed_versions":[],"id":"tcs_01M5NFZJ419X4TEW7S6SSNNGE7","modified_at":"2026-08-27T23:04:42.988080004Z","published_at":"2021-09-13T19:15:19.137Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-40823","https://security-tracker.debian.org/tracker/CVE-2021-40823"],"severity":{"label":"medium","score":5.9},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-40823","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-40823"}],"summary":"A logic error in the room key sharing functionality of matrix-js-sdk (aka Matrix Javascript SDK) before 12.4.1 allows a malicious Matrix homeserver present in an encrypted room to steal room encryptio"}