VULNERABILITY INTELLIGENCE

CVE-2023-43796

CVSS score5.3 MEDIUM
EPSS probability1.20%
CISA KEVNot currently listed
Published2023-10-31
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Description

Synapse is an open-source Matrix homeserver Prior to versions 1.95.1 and 1.96.0rc1, cached device information of remote users can be queried from Synapse. This can be used to enumerate the remote users known to a homeserver. System administrators are encouraged to upgrade to Synapse 1.95.1 or 1.96.0rc1 to receive a patch. As a workaround, the `federation_domain_whitelist` can be used to limit federation traffic with a homeserver.

Weakness classification

  • security-advisories@github.com: CWE-200
  • nvd@nist.gov: NVD-CWE-noinfo

Primary references