{"id":"CVE-2020-35623","details":"An issue was discovered in the CasAuth extension for MediaWiki through 1.35.1. Due to improper username validation, it allowed user impersonation with trivial manipulations of certain characters within a given username. An ordinary user may be able to login as a \"bureaucrat user\" who has a similar username, as demonstrated by usernames that differ only in (1) bidirectional override symbols or (2) blank space.","aliases":["BIT-mediawiki-2020-35623"],"modified":"2026-07-08T23:35:26.375832Z","published":"2020-12-21T23:15:12.437Z","references":[{"type":"FIX","url":"https://github.com/CWRUChielLab/CASAuth/pull/11"},{"type":"EVIDENCE","url":"https://phabricator.wikimedia.org/T263498"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/wikimedia/mediawiki","events":[{"introduced":"0"},{"last_affected":"3e26b5ff1468f98cf306575d125b29a6645bf2ea"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"1.35.1"}],"source":"CPE_RANGE","cpe":"cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*"}}],"versions":["1.35.1","1.35.0","1.35.0-rc.3","1.35.0-rc.2","1.35.0-rc.1","1.35.0-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-2020-35623.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"}]}