All errata/sisyphus/ALT-PU-2021-2791-2
ALT-PU-2021-2791-2

Package update element-web in branch sisyphus

Version1.8.4-alt1
Task#285172
Published2026-02-04
Max severityMEDIUM
Severity:

Closed issues (4)

CVE-2021-40823
MEDIUM5.9

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.

Published: 2021-09-13Modified: 2024-11-21
CVSS 2.0MEDIUM 4.3
CVSS:2.0/AV:N/AC:M/Au:N/C:P/I:N/A:N
CVSS 3.xMEDIUM 5.9
CVSS:3.x/CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
References
CVE-2021-40824
MEDIUM5.9

A logic error in the room key sharing functionality of Element Android before 1.2.2 and matrix-android-sdk2 (aka Matrix SDK for Android) before 1.2.2 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 attacker to decrypt end-to-end encrypted messages sent by affected clients.

Published: 2021-09-13Modified: 2024-11-21
CVSS 2.0MEDIUM 4.3
CVSS:2.0/AV:N/AC:M/Au:N/C:P/I:N/A:N
CVSS 3.xMEDIUM 5.9
CVSS:3.x/CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
References
GHSA-23cm-x6j7-6hq3
MEDIUM5.9

matrix-js-sdk can be tricked into disclosing E2EE room keys to a participating homeserver

Published: 2021-09-14Modified: 2023-08-08
CVSS 3.xMEDIUM 5.9
CVSS:3.x/CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
References