{"schema_version":"1.9.0","id":"CVE-2017-18871","published":"2020-06-19T17:15:11.867Z","modified":"2026-08-27T08:19:02.045711Z","aliases":["GHSA-jc6w-8r7f-vmp5","GO-2025-4184"],"related":["SUSE-SU-2025:4395-1","openSUSE-SU-2026:21483-1"],"details":"An issue was discovered in Mattermost Server before 4.5.0, 4.4.5, 4.3.4, and 4.2.2. It allows attackers to cause a denial of service (application crash) via an @ character before a JavaScript field name.","affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mattermost/mattermost","events":[{"introduced":"0"},{"fixed":"967838fb60f1a9010b3c6aa7cd64835a0f484cb1"},{"introduced":"8966452d1183e94fecc373b9d08c65a0573cbbc6"},{"fixed":"8f6bb1570dd234c63de5241eff9fbb268aad358c"},{"introduced":"a0017f184578d4d6250a9b54b50e656524078949"},{"fixed":"3890bc7079bf21330efdc45ae2741a4392d99e3c"},{"introduced":"5358b9c42cc99f72e7844062f28b2ddc3642a339"},{"last_affected":"03f5c939deb4a6ab2fd01639b5570799e4118bab"}],"database_specific":{"cpe":["cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*","cpe:2.3:a:mattermost:mattermost_server:4.5.0:rc1:*:*:*:*:*:*","cpe:2.3:a:mattermost:mattermost_server:4.5.0:rc2:*:*:*:*:*:*","cpe:2.3:a:mattermost:mattermost_server:4.5.0:rc3:*:*:*:*:*:*","cpe:2.3:a:mattermost:mattermost_server:4.5.0:rc4:*:*:*:*:*:*"],"extracted_events":[{"introduced":"0"},{"fixed":"4.2.2"},{"introduced":"4.3.0"},{"fixed":"4.3.4"},{"introduced":"4.4.0"},{"fixed":"4.4.5"},{"introduced":"4.5.0-rc1"},{"last_affected":"4.5.0-rc1"},{"introduced":"4.5.0-rc2"},{"last_affected":"4.5.0-rc2"},{"introduced":"4.5.0-rc3"},{"last_affected":"4.5.0-rc3"},{"introduced":"4.5.0-rc4"},{"last_affected":"4.5.0-rc4"}],"source":["CPE_RANGE","CPE_STRING"]}}],"versions":["4.5.0-rc1","4.5.0-rc2","v4.5.2-rc1","v4.5.2","v4.5.1-rc1","v4.5.1","v4.5.0-rc4","v4.5.0-rc3","v4.5.0-rc2","v4.5.0","v4.5.0-rc1","v4.4.3-rc1","v4.4.3","v4.4.2-rc1","v4.4.2","v4.3.2-rc1","v4.3.2","v4.4.1-rc1","v4.4.1","v4.4.0-rc5","v4.4.0-rc4","v4.4.0","v4.2.1-rc1","v4.2.1","v4.3.1-rc2","v4.3.1","v4.3.1-rc1","v4.3.0-rc4","v4.3.0-rc3","v4.3.0","v4.2.0-rc4","v4.2.0","v4.2.0-rc3","v4.2.0-rc2","v4.2.0-rc1","v0.5.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-18871.json"}}],"references":[{"type":"ADVISORY","url":"https://mattermost.com/security-updates/"}],"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}