What is CVE-2021-40823?

CVE-2021-40823 is a medium-severity vulnerability in Matrix Javascript_sdk, classified under Authentication Bypass by Spoofing. CVSS score: 5.9/10. Published 2021-09-13.

How severe is CVE-2021-40823?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Matrix Javascript_sdk

CVE-2021-40823

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 mes…

EPSS: 0.007 (47.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Matrix Javascript_sdk
N/a — versions n/a

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

cve@mitre.org (Third Party Advisory, x_refsource_MISC)
cve@mitre.org (x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2021-40823?: CVE-2021-40823 is a medium-severity vulnerability in Matrix Javascript_sdk, classified under Authentication Bypass by Spoofing. CVSS score: 5.9/10. Published 2021-09-13.
How severe is CVE-2021-40823?: Medium severity. CVSS v3 base score is 5.9 out of 10.