{"id":"CVE-2019-11842","details":"An issue was discovered in Matrix Sydent before 1.0.3 and Synapse before 0.99.3.1. Random number generation is mishandled, which makes it easier for attackers to predict a Sydent authentication token or a Synapse random ID.","aliases":["GHSA-gwf7-vfjf-wf6x","PYSEC-2019-185"],"modified":"2026-05-18T17:41:24.036989Z","published":"2019-05-09T18:29:07.197Z","references":[{"type":"ADVISORY","url":"https://matrix.org/blog/2019/05/03/security-updates-sydent-1-0-3-synapse-0-99-3-1-and-riot-android-0-9-0-0-8-99-0-8-28-a/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/matrix-org/sydent","events":[{"introduced":"0"},{"fixed":"1a89e424d105968e88d9c8c949ef3a9d9f0cb3be"}],"database_specific":{"cpe":"cpe:2.3:a:matrix:sydent:*:*:*:*:*:*:*:*","source":"CPE_FIELD","extracted_events":[{"introduced":"0"},{"fixed":"1.0.3"}]}}],"versions":["v1.0.1","v1.0.2","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2019-11842.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/matrix-org/synapse","events":[{"introduced":"0"},{"fixed":"f73f18fe7baba7e6f442e308112eeba91e4b8a61"}],"database_specific":{"cpe":"cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:*","source":"CPE_FIELD","extracted_events":[{"introduced":"0"},{"fixed":"0.99.3.1"}]}}],"versions":["v0.99.3","v0.99.3rc1","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/osv-test-cve-osv-conversion/osv-output/CVE-2019-11842.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}