{"cve":"CVE-2022-39335","nvd":{"published":"2023-05-26T14:15:09.600","modified":"2026-06-17T04:58:09.987","status":"Modified","description":"Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix Federation API allows remote homeservers to request the authorization events in a room. This is necessary so that a homeserver receiving some events can validate that those events are legitimate and permitted in their room. However, in versions of Synapse up to and including 1.68.0, a Synapse homeserver answering a query for authorization events does not sufficiently check that the requesting server should be able to access them. The issue was patched in Synapse 1.69.0. Homeserver administrators are advised to upgrade.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","score":5.0},"cwes":["CWE-862","CWE-200"],"references":["https://github.com/matrix-org/synapse/issues/13288","https://github.com/matrix-org/synapse/pull/13823","https://github.com/matrix-org/synapse/security/advisories/GHSA-45cj-f97f-ggwv","https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T2MBNMZAFY4RCZL2VGBGAPKGB4JUPZVS/","https://github.com/matrix-org/synapse/issues/13288"],"products":["matrix:synapse"],"source":"nvd","synced_at":"2026-10-19T21:38:24.161619714+00:00"},"epss":{"cve":"CVE-2022-39335","score":0.00635,"percentile":0.50441,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-45cj-f97f-ggwv","url":"https://osv.dev/vulnerability/GHSA-45cj-f97f-ggwv","summary":"Synapse does not apply enough checks to servers requesting auth events of events in a room","modified":"2024-09-24T20:33:02.949619Z","packages":[{"ecosystem":"PyPI","name":"matrix-synapse","purl":"pkg:pypi/matrix-synapse","ranges":["<1.69.0"],"fixed":["1.69.0"]}]},{"id":"PYSEC-2023-65","url":"https://osv.dev/vulnerability/PYSEC-2023-65","summary":"","modified":"2023-11-08T04:10:19.190421Z","packages":[{"ecosystem":"PyPI","name":"matrix-synapse","purl":"pkg:pypi/matrix-synapse","ranges":["<1.69.0"],"fixed":["1.69.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}