{"id":"CVE-2023-29529","aliases":["GHSA-6g67-q39g-r79q"],"url":"https://o3.security/vulnerability/CVE-2023-29529","summary":"matrix-js-sdk vulnerable to invisible eavesdropping in group calls","details":"matrix-js-sdk is the Matrix Client-Server SDK for JavaScript and TypeScript. An attacker present in a room where an MSC3401 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. This 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. Legacy 1:1 calls are unaffected. This is fixed in matrix-js-sdk 24.1.0. As a workaround, users may hold group calls in private rooms where only the exact users who are expected to participate in the call are present.","published":"2023-04-14T18:21:17.050Z","modified":"2026-07-15T01:49:14.217615229Z","cvss":{"score":5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"matrix-js-sdk","fixedVersion":"24.1.0"}],"fix":{"url":"https://github.com/matrix-org/matrix-spec-proposals/pull/3401","label":"matrix-org/matrix-spec-proposals#3401"},"references":[{"type":"WEB","url":"https://github.com/matrix-org/matrix-js-sdk/releases/tag/v24.1.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/29xxx/CVE-2023-29529.json"},{"type":"ADVISORY","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":"FIX","url":"https://github.com/matrix-org/matrix-spec-proposals/pull/3401"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:14.217615229Z"}}