{"id":"CVE-2019-18886","details":"An issue was discovered in Symfony 4.2.0 to 4.2.11 and 4.3.0 to 4.3.7. The ability to enumerate users was possible due to different handling depending on whether the user existed when making unauthorized attempts to use the switch users functionality. This is related to symfony/security.","aliases":["GHSA-4vpc-5jx4-cfqg"],"modified":"2026-08-03T14:24:01.567433Z","published":"2019-11-21T18:15:11.820Z","references":[{"type":"ADVISORY","url":"https://github.com/symfony/symfony/releases/tag/v4.3.8"},{"type":"ADVISORY","url":"https://symfony.com/blog/cve-2019-18886-prevent-user-enumeration-using-switch-user-functionality"},{"type":"ADVISORY","url":"https://symfony.com/blog/symfony-4-3-8-released"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/symfony/security-http","events":[{"introduced":"34e089af7d363bd2ded8ad15f06b2b97348b97e5"},{"last_affected":"a3eddd912d93a8c77ffee2b31448e13864257f4e"},{"introduced":"13594beb3faaeea891aaae9eeea8ffde16a99faf"},{"last_affected":"a2f67dfe0ecfb713734847f4ada0f4231e28ae71"}],"database_specific":{"cpe":"cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"4.2.0"},{"last_affected":"4.2.11"},{"introduced":"4.3.0"},{"last_affected":"4.3.7"}],"source":"CPE_RANGE"}}],"versions":["v4.3.7","v4.3.6","v4.2.11","v4.3.5","v4.3.4","v4.3.3","v4.3.2","v4.2.10","v4.3.1","v4.3.0-RC1","v4.3.0","v4.2.9","v4.2.8","v4.2.7","v4.2.6","v4.2.5","v4.2.4","v4.2.3","v4.2.2","v4.2.1","v4.2.0-RC1","v4.2.0-BETA2","v4.2.0"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2019-18886.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/symfony/symfony","events":[{"introduced":"0"},{"fixed":"87fb08703e62882a7a6fdb17672070e0ee12dd65"}],"database_specific":{"source":"REFERENCES"}}],"versions":["v4.3.7","v4.3.6","v4.3.5","v4.3.4","v4.3.3","v4.3.2","v4.3.1","v4.3.0","v4.3.0-RC1","v4.3.0-BETA2","v4.3.0-BETA1","v4.2.0-BETA2","v4.2.0-BETA1","v4.0.0-BETA4","v4.0.0-BETA3","v4.0.0-BETA2","v4.0.0-BETA1","v3.3.0-BETA1","v3.2.0-RC1","v3.2.0-BETA1","v3.0.0","v3.0.0-BETA1","v2.6.0-BETA1","v2.5.0-BETA1","v2.5.0-BETA2","v2.4.0-BETA2","v2.4.0-BETA1","v2.3.0-BETA2","v2.3.0-BETA1","v2.2.0-BETA2","v2.2.0-BETA1","v2.1.0","v2.1.0-RC2","v2.1.0-RC1","v2.1.0-BETA4","v2.1.0-BETA3","v2.1.0-BETA2","v2.1.0-BETA1","v2.0.0","v2.0.0-RC6","v2.0.0-RC5","v2.0.0-RC4","v2.0.0-RC3","v2.0.0-RC2","v2.0.0-RC1","v2.0.0BETA5","v2.0.0BETA4","v2.0.0BETA3","v2.0.0BETA2","v2.0.0BETA1","vPR9","vPR8","v2.0.0PR8","vPR6","vPR5","vPR4","vPR3"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2019-18886.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"}]}