{"id":"GHSA-rw54-6826-c8j5","summary":"yiisoft/yii2-authclient's Oauth2 PKCE implementation is vulnerable","details":"### Impact\n_What kind of vulnerability is it? Who is impacted?_\n\nOriginal Report:\n\n\u003e The Oauth2 PKCE implementation is vulnerable in 2 ways:\n\u003e 1. The `authCodeVerifier` should be removed after usage (similar to 'authState')\n\u003e 2. There is a risk for a \"downgrade attack\" if PKCE is being relied on for CSRF protection.\n\n### Patches\n_Has the problem been patched? What versions should users upgrade to?_\n\n2.2.15\n\n### Workarounds\n_Is there a way for users to fix or remediate the vulnerability without upgrading?_\n\nnot known yet.\n\n### References\n_Are there any links users can visit to find out more?_\n","aliases":["CVE-2023-50714"],"modified":"2026-09-10T03:50:09.131571556Z","published":"2023-12-18T19:34:20Z","database_specific":{"github_reviewed_at":"2023-12-18T19:34:20Z","nvd_published_at":"2023-12-22T19:15:09Z","cwe_ids":["CWE-287","CWE-347"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/yiisoft/yii2-authclient/security/advisories/GHSA-rw54-6826-c8j5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-50714"},{"type":"WEB","url":"https://github.com/yiisoft/yii2-authclient/commit/721ed974bc44137437b0cdc8454e137fff8db213"},{"type":"PACKAGE","url":"https://github.com/yiisoft/yii2-authclient"},{"type":"WEB","url":"https://github.com/yiisoft/yii2-authclient/blob/0d1c3880f4d79e20aa1d77c012650b54e69695ff/src/OAuth1.php#L158"},{"type":"WEB","url":"https://github.com/yiisoft/yii2-authclient/blob/0d1c3880f4d79e20aa1d77c012650b54e69695ff/src/OAuth2.php#L121"},{"type":"WEB","url":"https://github.com/yiisoft/yii2-authclient/blob/0d1c3880f4d79e20aa1d77c012650b54e69695ff/src/OpenIdConnect.php#L420"}],"affected":[{"package":{"name":"yiisoft/yii2-authclient","ecosystem":"Packagist","purl":"pkg:composer/yiisoft/yii2-authclient"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.2.15"}]}],"versions":["2.0.0","2.0.0-beta","2.0.0-rc","2.0.1","2.0.2","2.0.3","2.0.4","2.0.5","2.0.6","2.1.0","2.1.1","2.1.2","2.1.3","2.1.4","2.1.5","2.1.6","2.1.7","2.1.8","2.2.0","2.2.1","2.2.10","2.2.11","2.2.12","2.2.13","2.2.14","2.2.2","2.2.3","2.2.4","2.2.5","2.2.6","2.2.7","2.2.8","2.2.9"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/12/GHSA-rw54-6826-c8j5/GHSA-rw54-6826-c8j5.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N"}]}