{"id":"UBUNTU-CVE-2018-16515","details":"Matrix Synapse before 0.33.3.1 allows remote attackers to spoof events and possibly have unspecified other impacts by leveraging improper transaction and event signature validation.","modified":"2026-01-30T01:08:25.078577Z","published":"2018-09-18T21:29:00Z","related":["USN-6076-1"],"upstream":["CVE-2018-16515"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-16515"},{"type":"REPORT","url":"https://matrix.org/blog/2018/09/05/pre-disclosure-upcoming-critical-security-fix-for-synapse/"},{"type":"REPORT","url":"https://github.com/matrix-org/synapse/issues/3796"},{"type":"REPORT","url":"https://matrix.org/blog/2018/09/06/critical-security-update-synapse-0-33-3-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6076-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-16515"}],"affected":[{"package":{"name":"matrix-synapse","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/matrix-synapse@0.24.0+dfsg-1ubuntu0.1~esm1?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.24.0+dfsg-1ubuntu0.1~esm1"}]}],"versions":["0.19.2+dfsg-6","0.24.0+dfsg-1"],"ecosystem_specific":{"binaries":[{"binary_name":"matrix-synapse","binary_version":"0.24.0+dfsg-1ubuntu0.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-16515.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}