Vulnerability in Matrix Sydent

CVE-2023-38686

Sydent is an identity server for the Matrix communications protocol. Prior to version 2.5.6, if configured to send emails using TLS, Sydent does not verify SMTP servers' certificates. This makes Sydent's emails vulnerable to interception…

Vulnerability class: Improper Certificate Validation

EPSS: 0.002 (13.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2023-38686?
CVE-2023-38686 is a critical-severity vulnerability in Matrix Sydent, classified under Improper Certificate Validation. CVSS score: 9.3/10. Published 2023-08-04.
How severe is CVE-2023-38686?
Critical severity. CVSS v3 base score is 9.3 out of 10.