CVE-2021-40823: matrix javascript sdk

csirt@kutim:~/threat-intel/cve/CVE-2021-40823

CVSS 5.9 · Medium EPSS 0,66%

Kerentanan Authentication Bypass by Spoofing pada matrix javascript sdk. Skor CVSS 3.1 5.9 (Medium) menurut NVD.

Deskripsi (NVD)

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 encryption keys (via crafted Matrix protocol messages) that were originally sent by affected Matrix clients participating in that room. This allows the homeserver to decrypt end-to-end encrypted messages sent by affected clients.

Rincian

Terbit di NVD: 13 September 2021
Terakhir diubah: 17 Juni 2026
Status NVD: Modified
CVSS 3.1: 5.9 (Medium), sumber NVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N · uraikan di kalkulator
Jenis kelemahan (CWE): CWE-290: Authentication Bypass by Spoofing
EPSS (30 hari): 0,66% peluang dieksploitasi; lebih tinggi dari 50,3% CVE lain

Produk dan versi terdampak

Vendor	Produk	Versi terdampak
matrix	javascript sdk	Semua versi sebelum 12.4.1

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing advisory vendor
https://github.com/matrix-org/matrix-js-sdk/releases/tag/v12.4.1 advisory pihak ketiga

Sumber: NVD · CVE.org · EPSS. Halaman ini disusun otomatis dari data tersebut; pembaruan terakhir 5 Okt 2026, 20:10 WITA. Kalau sistem di Perangkat Daerah memakai produk ini dan butuh bantuan, laporkan lewat kanal pelaporan.