CVE-2023-29529 json
matrix-js-sdk vulnerable to invisible eavesdropping in group calls
published 2023-04-14 3 y ago modified 2026-09-10 1 mo ago also GHSA-6g67-q39g-r79q , EUVD-2023-1214
- cvss
- 5.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 45%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- npm matrix-js-sdk 24.1.0
- matrix javascript_sdk 24.1.0
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 21 mo ago
Exploit prediction
0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.0 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N |
| NVD | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| GitHub | 3.1 | 5.0 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | matrix-js-sdk | <24.1.0 |
24.1.0 |
Affected products
- matrix-org matrix-js-sdk
Classification
- Weakness
-
- CWE-862 Missing Authorization
References
-
github.com
/matrix-org/matrix-spec-proposals/pull/3401
web, issue-tracking, patch
-
github.com
/matrix-org/matrix-js-sdk/security/advisories/GHSA-6g67-q39g-r79q
web, vendor-advisory
-
github.com
/matrix-org/matrix-js-sdk/releases/tag/v24.1.0
web, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2023-29529
advisory
-
github.com
/matrix-org/matrix-js-sdk
package
Sources
- CVE List CVE-2023-29529
- GitHub Advisory GHSA-6g67-q39g-r79q
- NVD CVE-2023-29529
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