{"id":"CVE-2018-20745","aliases":["EUVD-2022-3621","GHSA-cr6r-6xm9-ww22"],"status":"published","title":"Yii Incorrectly Implements CORS","description":"Yii 2.x through 2.0.15.1 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.","severity":{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.00544,"percentile":0.45919,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-346"],"published":"2019-01-28T08:00:00Z","modified":"2026-10-20T10:50:06Z","fixes":[{"ecosystem":"Packagist","package":"yiisoft/yii2","fixed_in":["2.0.16"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"yiisoft/yii2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.16"}]}]},{"source":"osv","ecosystem":"Packagist","package":"yiisoft/yii2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.16"}]}],"versions":["2.0.0","2.0.0-alpha","2.0.0-beta","2.0.0-rc","2.0.1","2.0.10","2.0.11","2.0.11.1","2.0.11.2","2.0.12","2.0.12.1","2.0.12.2","2.0.13","2.0.13.1","2.0.13.2","2.0.13.3","2.0.14","2.0.14.1","2.0.14.2","2.0.15","2.0.15.1","2.0.2","2.0.3","2.0.4","2.0.5","2.0.6","2.0.7","2.0.8","2.0.9"]}],"products":[{"vendor":"yiiframework","product":"yii"}],"references":[{"url":"https://www.usenix.org/system/files/conference/usenixsecurity18/sec18-chen.pdf","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://github.com/yiisoft/yii2/issues/16193","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Third Party Advisory","report","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-20745","tags":["advisory"]},{"url":"https://github.com/yiisoft/yii2/pull/16198","tags":["web"]},{"url":"https://github.com/advisories/GHSA-cr6r-6xm9-ww22"}],"sources":{"cve":[{"id":"CVE-2018-20745","description":"Yii 2.x through 2.0.15.1 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.","status":"published","published":"2019-01-28T08:00:00Z","modified":"2024-09-17T00:56:20.56Z","updated_at":"2026-11-02T14:34:59.872731Z"}],"euvd":[{"id":"EUVD-2022-3621","description":"Yii 2.x through 2.0.15.1 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.","status":"published","published":"2019-01-28T08:00:00Z","modified":"2024-09-17T00:56:20Z","updated_at":"2026-11-03T00:28:54.507992Z"}],"ghsa":[{"id":"GHSA-cr6r-6xm9-ww22","title":"Yii Incorrectly Implements CORS","description":"Yii 2.x through 2.0.15.1 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.","status":"published","published":"2022-05-14T01:33:07Z","modified":"2023-08-28T23:18:11Z","cvss":[{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T14:37:01.345964Z"}],"nvd":[{"id":"CVE-2018-20745","description":"Yii 2.x through 2.0.15.1 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.","status":"published","published":"2019-01-28T08:29:00.527Z","modified":"2026-06-17T01:53:23.537Z","cvss":[{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T14:04:53.728218Z"}],"osv":[{"id":"CVE-2018-20745","description":"Yii 2.x through 2.0.15.1 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.","status":"published","published":"2019-01-28T08:29:00.527Z","modified":"2026-10-20T10:50:06.813567017Z","cvss":[{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:09.145458Z"},{"id":"GHSA-cr6r-6xm9-ww22","title":"Yii Incorrectly Implements CORS","description":"Yii 2.x through 2.0.15.1 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.","status":"published","published":"2022-05-14T01:33:07Z","modified":"2024-02-16T08:04:27.924059Z","cvss":[{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T15:46:45.28161Z"}]}}