CVSS 3.1 Score 9.3 of 10 (high)


Published Aug 4, 2023
Updated: Aug 10, 2023
CWE ID 295


CVE-2023-38686 is a vulnerability in Sydent, an identity server for the Matrix communications protocol. Versions prior to 2.5.6 are affected by this vulnerability, which allows interception of Sydent's emails through a man-in-the-middle (MITM) attack if configured to send emails using TLS without verifying SMTP servers' certificates. Attackers with privileged network access can intercept room invitations and address confirmation emails. The vulnerability has been patched in Sydent 2.5.6, and organizations should ensure that the server certificate is trusted when applying the patch. As a workaround, one can prevent Sydent's emails from being sent by configuring the SMTP server to a loopback or non-routable address without a listening SMTP server. The vulnerability has a base severity score of 9.3 (CRITICAL) and high impact on confidentiality and integrity, according to the Common Vulnerability Scoring System (CVSS) version 3.1 rating provided by [email protected].


Explore Beyond the CVE Basics with Recorded Future's Vulnerability Intelligence

Note: This is just a basic overview providing quick insights into CVE-2023-38686 information. Gain full access to comprehensive CVE data, risk scores, prioritization, and mitigation data through Recorded Future's Vulnerability Intelligence:
  • Prioritize with Risk-Based Scoring
  • Explore the Extensive Vulnerability Database
  • Receive Early Alerts on Emerging CVEs
  • Focus on Critical Exploitable Vulnerabilities
  • Streamline Remediation with Integration Options