{"id":"CVE-2021-30156","details":"An issue was discovered in MediaWiki before 1.31.12 and 1.32.x through 1.35.x before 1.35.2. Special:Contributions can leak that a \"hidden\" user exists.","aliases":["BIT-mediawiki-2021-30156"],"modified":"2026-07-08T05:57:03.838891750Z","published":"2021-04-09T07:15:16.217Z","database_specific":{"unresolved_ranges":[{"vendor_product":"fedoraproject:fedora","cpes":["cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*","cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"33"},{"last_affected":"33"},{"introduced":"34"},{"last_affected":"34"}],"source":"CPE_STRING"}]},"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/26UJGHF7LJDOCQN6A3Z4PM7PYRKENJHE/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2OMSV7B2TCFBOCICN3B4SMQP5HVRJQIT/"},{"type":"FIX","url":"https://phabricator.wikimedia.org/T276306"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/wikimedia/mediawiki","events":[{"introduced":"0"},{"fixed":"ef13e11da4bcab62a8cc6f5459cd094e6881f326"},{"introduced":"0fbb878ef366477535a709b0c2564bdcf4b176d1"},{"fixed":"e5823c068a2e0d8af72538fe5cd152ddb43c58e9"}],"database_specific":{"cpe":"cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"1.31.12"},{"introduced":"1.32.0"},{"fixed":"1.35.2"}],"source":"CPE_RANGE"}}],"versions":["1.35.1","1.31.11","1.31.8","1.35.0","1.31.10","1.31.9","1.35.0-rc.3","1.35.0-rc.2","1.35.0-rc.1","1.35.0-rc.0","1.31.7","1.31.6","1.31.5","1.31.4","1.31.3","1.31.2","1.31.1","1.31.0","1.31.0-rc.2","1.31.0-rc.1","1.31.0-rc.0","test-hashar-for-ci","1.6.0","1.5.0beta4","1.5.0beta3","1.5.0beta2","1.5.0beta1","1.5.0alpha2","1.5.0alpha1","1.3.0beta1","1.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-30156.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"}]}