{"id":"CVE-2023-43796","summary":"Synapse vulnerable to leak of remote user device information","details":"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.","aliases":["GHSA-mp92-3jfm-3575","PYSEC-2023-230"],"modified":"2026-08-12T03:51:40.831498580Z","published":"2023-10-31T16:52:48.505Z","related":["openSUSE-SU-2024:13392-1"],"database_specific":{"cwe_ids":["CWE-200"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/43xxx/CVE-2023-43796.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2IDEEZMFJBDLTFHQUTZRJJNCOZGQ2ZVS/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VH3RNC5ZPQZ4OKPSL4E6BBJSZOQLGDEY/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/43xxx/CVE-2023-43796.json"},{"type":"ADVISORY","url":"https://github.com/matrix-org/synapse/security/advisories/GHSA-mp92-3jfm-3575"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-43796"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202401-12"},{"type":"FIX","url":"https://github.com/matrix-org/synapse/commit/daec55e1fe120c564240c5386e77941372bf458f"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/matrix-org/synapse","events":[{"introduced":"0"},{"fixed":"a11511954a58975d2e5400257a0cecfd27413447"},{"fixed":"daec55e1fe120c564240c5386e77941372bf458f"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.95.1"}],"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:*"}}],"versions":["v1.95.0","v1.95.0rc1","v1.94.0rc1","v1.90.0rc1","v1.88.0rc1","v1.87.0rc1","v1.84.0rc1","v1.81.0rc1","v1.79.0rc1","v1.78.0rc1","v1.76.0rc1","v1.75.0rc1","v1.63.0rc1","v1.62.0rc1","v1.52.0rc1","v1.49.0rc1","v1.40.0rc1","v1.36.0rc1","v1.35.0rc1","v1.34.0rc1","v1.32.0rc1","v1.31.0rc1","v1.30.0rc1","v1.29.0rc1","v1.27.0rc1","v1.24.0rc1","v1.23.0rc1","v1.17.0rc1","v1.18.0rc1","v1.16.0rc1","v1.15.0rc1","v1.14.0rc1","v1.12.0rc1","v1.6.0rc1","v1.11.0rc1","v1.3.0rc1","v1.1.0rc2","v1.1.0rc1","v1.10.0rc1","v1.9.0rc1","v1.9.0.dev2","v1.9.0.dev1","v1.8.0rc1","v1.5.0rc1","v1.4.0rc1","v0.99.5.1.dev0","v0.99.4rc1","v0.99.2rc1","v0.99.1rc1","hhs-8","hhs-7","hhs-6","hhs-5","hhs-3","hhs-2","hhs-1","v0.32.2","v0.32.0","v0.32.0rc1","v0.28.0-rc1","v0.25.0-rc1","v0.23.0-rc2","v0.23.0-rc1","v0.18.5","v0.18.4","v0.18.3","v0.18.2","v0.18.1","v0.18.0","v0.17.3","v0.17.2","v0.17.1","v0.17.0","v0.16.1-r1","v0.16.1","v0.16.0","v0.14.0","v0.13.3","v0.13.2","v0.13.1","v0.12.0","v0.11.1","v0.11.0-r2","v0.11.0-r1","v0.11.0","v0.10.0-r2","v0.10.0-r1","v0.10.0","v0.9.3","v0.9.2-r2","v0.9.2-r1","v0.9.2","v0.9.1","v0.9.0-r5","v0.9.0-r4","v0.9.0-r3","v0.9.0-r2","v0.9.0-r1","v0.9.0","v0.8.1-r4","v0.8.1-r3","v0.8.1-r2","v0.8.1-r1","v0.8.1","v0.8.0","v0.7.1-r4","v0.7.1-r3","v0.7.1-r2","v0.7.1-r1","v0.7.1","v0.7.0f","v0.7.0e","v0.7.0d","v0.7.0c","v0.7.0b","v0.7.0a","v0.7.0","v0.6.1f","v0.6.1e","v0.6.1d","v0.6.1c","v0.6.1b","v0.6.1a","v0.6.1","v0.6.0b","v0.6.0a","v0.6.0","v0.5.4a","v0.5.4","v0.5.3c","v0.5.3b","v0.5.3a","v0.5.3","v0.5.2","v0.5.1","v0.5.0","v0.4.2","v0.4.1","v0.3.4","v0.3.3","v0.3.0","v0.2.2","v0.2.1a","v0.2.1","v0.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-43796.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"}]}