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CVE-2023-43796 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CNA: [email protected]CVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/matrix-org/synapse/commit/daec55e1fe120c564240c5386e77941372bf458f	CVE	Patch
https://github.com/matrix-org/synapse/security/advisories/GHSA-mp92-3jfm-3575	CVE	Vendor Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/2IDEEZMFJBDLTFHQUTZRJJNCOZGQ2ZVS/	CVE	Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/VH3RNC5ZPQZ4OKPSL4E6BBJSZOQLGDEY/	CVE	Mailing List
https://security.gentoo.org/glsa/202401-12	CVE
https://github.com/matrix-org/synapse/commit/daec55e1fe120c564240c5386e77941372bf458f	[email protected]	Patch
https://github.com/matrix-org/synapse/security/advisories/GHSA-mp92-3jfm-3575	[email protected]	Vendor Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/2IDEEZMFJBDLTFHQUTZRJJNCOZGQ2ZVS/	[email protected]	Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/VH3RNC5ZPQZ4OKPSL4E6BBJSZOQLGDEY/	[email protected]	Mailing List
https://security.gentoo.org/glsa/202401-12	[email protected]

see all 10 references

Weakness Enumeration

CWE-ID	CWE Name	Source
NVD-CWE-noinfo	Insufficient Information to Classify Weakness	[email protected]
CWE-200	Exposure of Sensitive Information to an Unauthorized Actor	[email protected]

Affected Products

Product	Versions
matrix synapse	< 1.95.1
CPE cpe:2.3:a:matrix:synapse:::::::: Remediation No remediation found in references.
fedoraproject fedora	38 39
CPE cpe:2.3:o:fedoraproject:fedora:38:::::::* cpe:2.3:o:fedoraproject:fedora:39:::::::* Remediation No remediation found in references.

Change History

8 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Feb 13, 2025	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Jan 7, 2024	CVE Modified	[email protected]
Dec 28, 2023	Modified Analysis	[email protected]
Nov 10, 2023	CVE Modified	[email protected]
Nov 8, 2023	Initial Analysis	[email protected]