CVE-2021-40823
Medium
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.
SeverityMedium
CVSS5.9
Exploit probability—
ProductMatrix Javascript Sdk
PublishedSep 13, 2021
First seenSep 13, 2021
How to fix
Update
- matrix javascript_sdk12.4.1 or later
- matrix-js-sdk12.4.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| matrix javascript_sdk | v < 12.4.1 | 12.4.1 |
| matrix-js-sdknpm | v < 12.4.1 | 12.4.1 |
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