{"id":"CVE-2020-35623","aliases":["BIT-mediawiki-2020-35623","EUVD-2020-23289","GHSA-3qff-43xr-cvvj"],"status":"published","title":"An issue was discovered in the CasAuth extension for MediaWiki through 1.35.1. Due to improper...","description":"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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.01096,"percentile":0.65988,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20","CWE-522","CWE-706"],"published":"2020-12-21T22:37:15Z","modified":"2026-10-24T10:31:04Z","fixes":[{"ecosystem":"Bitnami","package":"mediawiki","fixed_in":["1.35.2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"mediawiki","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.35.2"}]}]}],"products":[{"vendor":"mediawiki","product":"mediawiki"}],"references":[{"url":"https://phabricator.wikimedia.org/T263498","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","web","evidence"]},{"url":"https://github.com/CWRUChielLab/CASAuth/pull/11","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","web","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-35623","tags":["web"]},{"url":"https://github.com/advisories/GHSA-3qff-43xr-cvvj"}],"sources":{"cve":[{"id":"CVE-2020-35623","description":"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.","status":"published","published":"2020-12-21T22:37:15Z","modified":"2024-08-04T17:09:14.084Z","updated_at":"2026-11-02T14:35:57.975444Z"}],"euvd":[{"id":"EUVD-2020-23289","description":"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.","status":"published","published":"2020-12-21T22:37:15Z","modified":"2024-08-04T17:09:14Z","updated_at":"2026-11-03T03:07:05.848444Z"}],"ghsa":[{"id":"GHSA-3qff-43xr-cvvj","title":"An issue was discovered in the CasAuth extension for MediaWiki through 1.35.1. Due to improper...","description":"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.","status":"published","published":"2022-05-24T17:37:10Z","modified":"2023-01-29T05:05:49Z","cwes":["CWE-522"],"updated_at":"2026-11-02T14:45:52.819939Z"}],"nvd":[{"id":"CVE-2020-35623","description":"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.","status":"published","published":"2020-12-21T23:15:12.437Z","modified":"2026-06-17T03:14:02.12Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-20","CWE-706"],"updated_at":"2026-11-02T14:06:27.73474Z"}],"osv":[{"id":"CVE-2020-35623","description":"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.","status":"published","published":"2020-12-21T23:15:12.437Z","modified":"2026-10-24T10:31:04.024393131Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:44:16.612899Z"},{"id":"BIT-mediawiki-2020-35623","description":"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.","status":"published","published":"2024-03-06T11:13:14.694Z","modified":"2025-04-03T14:40:37.652Z","updated_at":"2026-11-02T15:28:33.072289Z"}]}}