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Vulnerability details: VCID-9747-ab3e-4bbg
Vulnerability ID VCID-9747-ab3e-4bbg
Aliases CVE-2023-29529
GHSA-6g67-q39g-r79q
Summary Missing Authorization 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.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-862 Missing Authorization
System Score Found at
epss 0.00184 https://api.first.org/data/v1/epss?cve=CVE-2023-29529
epss 0.00184 https://api.first.org/data/v1/epss?cve=CVE-2023-29529
epss 0.00314 https://api.first.org/data/v1/epss?cve=CVE-2023-29529
epss 0.00314 https://api.first.org/data/v1/epss?cve=CVE-2023-29529
epss 0.00314 https://api.first.org/data/v1/epss?cve=CVE-2023-29529
epss 0.00316 https://api.first.org/data/v1/epss?cve=CVE-2023-29529
epss 0.00316 https://api.first.org/data/v1/epss?cve=CVE-2023-29529
epss 0.00316 https://api.first.org/data/v1/epss?cve=CVE-2023-29529
epss 0.00316 https://api.first.org/data/v1/epss?cve=CVE-2023-29529
epss 0.00316 https://api.first.org/data/v1/epss?cve=CVE-2023-29529
epss 0.00316 https://api.first.org/data/v1/epss?cve=CVE-2023-29529
epss 0.00316 https://api.first.org/data/v1/epss?cve=CVE-2023-29529
epss 0.00316 https://api.first.org/data/v1/epss?cve=CVE-2023-29529
epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2023-29529
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-6g67-q39g-r79q
cvssv3.1 5.0 https://github.com/matrix-org/matrix-js-sdk
generic_textual MODERATE https://github.com/matrix-org/matrix-js-sdk
cvssv3.1 5 https://github.com/matrix-org/matrix-js-sdk/releases/tag/v24.1.0
cvssv3.1 5.0 https://github.com/matrix-org/matrix-js-sdk/releases/tag/v24.1.0
generic_textual MODERATE https://github.com/matrix-org/matrix-js-sdk/releases/tag/v24.1.0
ssvc Track https://github.com/matrix-org/matrix-js-sdk/releases/tag/v24.1.0
cvssv3.1 5 https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-6g67-q39g-r79q
cvssv3.1 5.0 https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-6g67-q39g-r79q
cvssv3.1_qr MODERATE https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-6g67-q39g-r79q
generic_textual MODERATE https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-6g67-q39g-r79q
ssvc Track https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-6g67-q39g-r79q
cvssv3.1 5 https://github.com/matrix-org/matrix-spec-proposals/pull/3401
cvssv3.1 5.0 https://github.com/matrix-org/matrix-spec-proposals/pull/3401
generic_textual MODERATE https://github.com/matrix-org/matrix-spec-proposals/pull/3401
ssvc Track https://github.com/matrix-org/matrix-spec-proposals/pull/3401
cvssv3.1 5.0 https://nvd.nist.gov/vuln/detail/CVE-2023-29529
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2023-29529
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2023-29529
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-29529
https://github.com/matrix-org/matrix-js-sdk
https://github.com/matrix-org/matrix-js-sdk/releases/tag/v24.1.0
https://github.com/matrix-org/matrix-spec-proposals/pull/3401
CVE-2023-29529 https://nvd.nist.gov/vuln/detail/CVE-2023-29529
GHSA-6g67-q39g-r79q https://github.com/advisories/GHSA-6g67-q39g-r79q
GHSA-6g67-q39g-r79q https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-6g67-q39g-r79q
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N Found at https://github.com/matrix-org/matrix-js-sdk
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N Found at https://github.com/matrix-org/matrix-js-sdk/releases/tag/v24.1.0
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N Found at https://github.com/matrix-org/matrix-js-sdk/releases/tag/v24.1.0
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-02-06T18:45:25Z/ Found at https://github.com/matrix-org/matrix-js-sdk/releases/tag/v24.1.0
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N Found at https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-6g67-q39g-r79q
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N Found at https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-6g67-q39g-r79q
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-02-06T18:45:25Z/ Found at https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-6g67-q39g-r79q
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N Found at https://github.com/matrix-org/matrix-spec-proposals/pull/3401
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N Found at https://github.com/matrix-org/matrix-spec-proposals/pull/3401
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-02-06T18:45:25Z/ Found at https://github.com/matrix-org/matrix-spec-proposals/pull/3401
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2023-29529
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.39925
EPSS Score 0.00184
Published At April 26, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:51:09.280429+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/npm/matrix-js-sdk/CVE-2023-29529.yml 38.0.0