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.
References (5)
Core 5
Core References
Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/2IDEEZMFJBDLTFHQUTZRJJNCOZGQ2ZVS/
Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/VH3RNC5ZPQZ4OKPSL4E6BBJSZOQLGDEY/
Third Party Advisory
https://security.gentoo.org/glsa/202401-12
Vendor Advisory x_refsource_confirm
https://github.com/matrix-org/synapse/security/advisories/GHSA-mp92-3jfm-3575
Scores
CVSS v3
5.3
EPSS
0.0024
EPSS Percentile
46.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Details
CWE
CWE-200
Status
published
Products (4)
fedoraproject/fedora
38
fedoraproject/fedora
39
matrix/synapse
< 1.95.1
pypi/matrix-synapse
0 - 1.95.1PyPI
Published
Oct 31, 2023
Tracked Since
Feb 18, 2026