CVE-2021-40823

State: Published
Severity: Not scored
Published: Sep 13, 2021
Updated: Aug 4, 2024
Reserved: Sep 9, 2021

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
n/an/a	n/aAffected

References

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

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