{"id":"CVE-2019-18835","details":"Matrix Synapse before 1.5.0 mishandles signature checking on some federation APIs. Events sent over /send_join, /send_leave, and /invite may not be correctly signed, or may not come from the expected servers.","aliases":["GHSA-cppw-2mf8-qpm5","PYSEC-2019-186"],"modified":"2026-03-14T09:34:39.795559Z","published":"2019-11-08T00:15:10.413Z","references":[{"type":"ADVISORY","url":"https://github.com/matrix-org/synapse/releases/tag/v1.5.0"},{"type":"FIX","url":"https://github.com/matrix-org/synapse/pull/6262"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/matrix-org/synapse","events":[{"introduced":"0"},{"fixed":"9ffcf0f7ba72f16e366f04db6384a9233b1808cb"}],"database_specific":{"versions":[{"introduced":"0"},{"fixed":"1.5.0"}]}}],"versions":["0.34.0rc2","alpha","hhs-1","hhs-2","hhs-3","hhs-4","hhs-5","hhs-6","hhs-7","hhs-8","v0.0.0","v0.0.1","v0.1.0","v0.1.1","v0.1.2","v0.10.0","v0.10.0-r1","v0.10.0-r2","v0.10.0-rc1","v0.10.0-rc2","v0.10.0-rc3","v0.10.0-rc4","v0.10.0-rc5","v0.10.0-rc6","v0.10.1-rc1","v0.11.0","v0.11.0-r1","v0.11.0-r2","v0.11.0-rc1","v0.11.0-rc2","v0.11.1","v0.12.0","v0.12.0-rc1","v0.12.0-rc2","v0.12.0-rc3","v0.12.1-rc1","v0.13.0","v0.13.1","v0.13.2","v0.13.3","v0.14.0","v0.14.0-rc1","v0.14.0-rc2","v0.15.0-rc1","v0.16.0","v0.16.0-rc1","v0.16.0-rc2","v0.16.1","v0.16.1-r1","v0.16.1-rc1","v0.17.0","v0.17.0-rc1","v0.17.0-rc2","v0.17.0-rc3","v0.17.0-rc4","v0.17.1","v0.17.1-rc1","v0.17.2","v0.17.2-rc1","v0.17.3","v0.18.0","v0.18.0-rc1","v0.18.1","v0.18.1-rc1","v0.18.2","v0.18.2-rc1","v0.18.2-rc2","v0.18.2-rc3","v0.18.2-rc4","v0.18.2-rc5","v0.18.3","v0.18.4","v0.18.4-rc1","v0.18.5","v0.18.5-rc1","v0.18.5-rc2","v0.18.5-rc3","v0.18.6","v0.18.6-rc1","v0.18.6-rc2","v0.18.6-rc3","v0.18.7","v0.18.7-rc1","v0.18.7-rc2","v0.19.0","v0.19.0-rc1","v0.19.0-rc2","v0.19.0-rc3","v0.19.0-rc4","v0.19.1","v0.19.2","v0.19.3","v0.19.3-rc1","v0.19.3-rc2","v0.2.0","v0.2.1","v0.2.1a","v0.2.2","v0.2.3","v0.20.0","v0.20.0-rc1","v0.21.0","v0.21.0-rc1","v0.21.0-rc2","v0.21.0-rc3","v0.21.1","v0.22.0","v0.22.0-rc1","v0.22.0-rc2","v0.22.1","v0.23.0","v0.23.0-rc1","v0.23.0-rc2","v0.23.1","v0.24.0","v0.24.0-rc1","v0.24.1","v0.25.0","v0.25.0-rc1","v0.25.1","v0.26.0","v0.26.0-rc1","v0.26.1","v0.27.0","v0.27.0-rc1","v0.27.0-rc2","v0.27.1","v0.27.2","v0.27.3","v0.27.3-rc1","v0.27.3-rc2","v0.27.4","v0.28.0","v0.28.0-rc1","v0.28.1","v0.29.0","v0.29.0-rc1","v0.29.1","v0.3.0","v0.3.1","v0.3.2","v0.3.3","v0.3.4","v0.30.0","v0.30.0-rc1","v0.31.0","v0.31.0-rc1","v0.31.1","v0.31.2","v0.32.0","v0.32.0rc1","v0.32.1","v0.32.2","v0.33.0","v0.33.0rc1","v0.33.1","v0.33.2","v0.33.2rc1","v0.33.3","v0.33.3.1","v0.33.3rc1","v0.33.3rc2","v0.33.4","v0.33.4rc1","v0.33.4rc2","v0.33.5","v0.33.5.1","v0.33.5rc1","v0.33.6","v0.33.6rc1","v0.33.7","v0.33.7rc1","v0.33.7rc2","v0.33.8","v0.33.8rc1","v0.33.8rc2","v0.33.9","v0.33.9rc1","v0.34.0","v0.34.0rc1","v0.34.0rc2","v0.34.1","v0.34.1+1","v0.34.1.1","v0.34.1rc1","v0.4.1","v0.4.2","v0.5.0","v0.5.1","v0.5.2","v0.5.3","v0.5.3a","v0.5.3b","v0.5.3c","v0.5.4","v0.5.4a","v0.6.0","v0.6.0a","v0.6.0b","v0.6.1","v0.6.1a","v0.6.1b","v0.6.1c","v0.6.1d","v0.6.1e","v0.6.1f","v0.7.0","v0.7.0a","v0.7.0b","v0.7.0c","v0.7.0d","v0.7.0e","v0.7.0f","v0.7.1","v0.7.1-r1","v0.7.1-r2","v0.7.1-r3","v0.7.1-r4","v0.8.0","v0.8.1","v0.8.1-r1","v0.8.1-r2","v0.8.1-r3","v0.8.1-r4","v0.9.0","v0.9.0-r1","v0.9.0-r2","v0.9.0-r3","v0.9.0-r4","v0.9.0-r5","v0.9.1","v0.9.2","v0.9.2-r1","v0.9.2-r2","v0.9.3","v0.9.3-rc1","v0.99.0","v0.99.0rc1","v0.99.0rc2","v0.99.0rc3","v0.99.0rc4","v0.99.1","v0.99.1.1","v0.99.1rc1","v0.99.1rc2","v0.99.2","v0.99.2rc1","v0.99.3","v0.99.3.1","v0.99.3.2","v0.99.3rc1","v0.99.4","v0.99.4rc1","v0.99.5","v0.99.5.1","v0.99.5.1.dev0","v0.99.5.2","v0.99.5rc1","v1.0.0","v1.0.0rc1","v1.0.0rc2","v1.0.0rc3","v1.1.0","v1.1.0rc1","v1.1.0rc2","v1.2.0","v1.2.0rc1","v1.2.0rc2","v1.2.1","v1.3.0","v1.3.0rc1","v1.3.1","v1.4.0","v1.4.0rc1","v1.4.0rc2","v1.4.1","v1.4.1rc1","v1.5.0rc1","v1.5.0rc2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-18835.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}