{"id":"GHSA-6g67-q39g-r79q","summary":"matrix-js-sdk vulnerable to invisible eavesdropping in group calls","details":"### Impact\n\nAn attacker present in a room where an [MSC3401](https://github.com/matrix-org/matrix-spec-proposals/pull/3401) group call is taking place can eavesdrop on the video and audio of participants using matrix-js-sdk, without their knowledge. To affected matrix-js-sdk users, the attacker will not appear to be participating in the call.\n\nThis attack is possible because matrix-js-sdk's group call implementation accepts incoming direct calls from other users, even if they have not yet declared intent to participate in the group call, as a means of resolving a race condition in call setup. Affected versions do not restrict access to the user's outbound media in this case.\n\nLegacy 1:1 calls are unaffected.\n\n### Workarounds\n\nUsers may hold group calls in private rooms where only the exact users who are expected to participate in the call are present.","aliases":["CVE-2023-29529"],"modified":"2026-09-10T03:49:53.562127511Z","published":"2023-04-14T16:14:17Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2023-04-14T16:14:17Z","nvd_published_at":"2023-04-14T19:15:00Z","cwe_ids":["CWE-862"],"severity":"MODERATE"},"references":[{"type":"WEB","url":"https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-6g67-q39g-r79q"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-29529"},{"type":"WEB","url":"https://github.com/matrix-org/matrix-spec-proposals/pull/3401"},{"type":"PACKAGE","url":"https://github.com/matrix-org/matrix-js-sdk"},{"type":"WEB","url":"https://github.com/matrix-org/matrix-js-sdk/releases/tag/v24.1.0"}],"affected":[{"package":{"name":"matrix-js-sdk","ecosystem":"npm","purl":"pkg:npm/matrix-js-sdk"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"24.1.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/04/GHSA-6g67-q39g-r79q/GHSA-6g67-q39g-r79q.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N"}]}