Published: 13/09/2021 Updated: 08/08/2023

CVSS v2 Base Score: 4.3 | Impact Score: 2.9 | Exploitability Score: 8.6

CVSS v3 Base Score: 5.9 | Impact Score: 3.6 | Exploitability Score: 2.2

VMScore: 383

Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N

A logic error in the room key sharing functionality of matrix-js-sdk (aka Matrix Javascript SDK) prior to 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.

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matrix javascript sdk

A security has been found in matrix-js-sdk before version 1241, as used by Element Web/Desktop before version 184 In certain circumstances it may be possible to trick vulnerable clients into disclosing encryption keys for messages previously sent by that client to user accounts later compromised by an attacker Exploiting this vulnerability t ...

CWE-290 https://github.com/matrix-org/matrix-js-sdk/releases/tag/v12.4.1 https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing https://nvd.nist.gov https://security.archlinux.org/CVE-2021-40823

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CVE-2021-40823

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