{"id":"DEBIAN-CVE-2018-12423","details":"In Synapse before 0.31.2, unauthorised users can hijack rooms when there is no m.room.power_levels event in force.","modified":"2026-08-11T20:49:48.872660419Z","published":"2018-06-14T21:29:00.253Z","withdrawn":"2026-08-11T20:49:48.872660173Z","upstream":["CVE-2018-12423"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2018-12423"}],"affected":[{"package":{"name":"matrix-synapse","ecosystem":"Debian:14","purl":"pkg:deb/debian/matrix-synapse?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.31.2+dfsg-1"}]}],"versions":["0.19.2+dfsg-3","0.19.2+dfsg-4","0.19.2+dfsg-5","0.19.2+dfsg-6","0.24.0+dfsg-1","0.27.2+dfsg-1","0.28.0+dfsg-1","0.28.0+dfsg-2","0.28.1+dfsg-1","0.29.1+dfsg-1","0.30.0+dfsg-1","0.31.0+dfsg-1","0.31.0+dfsg-2","0.31.1+dfsg-1","0.31.1+dfsg-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2018-12423.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"}]}