{"id":"CVE-2023-50714","summary":"The Oauth2 PKCE implementation is vulnerable","details":"yii2-authclient is an extension that adds OpenID, OAuth, OAuth2 and OpenId Connect consumers for the Yii framework 2.0. In yii2-authclient prior to version 2.2.15, the Oauth2 PKCE implementation is vulnerable in 2 ways. First, the `authCodeVerifier` should be removed after usage (similar to `authState`). Second, there is a risk for a `downgrade attack` if PKCE is being relied on for CSRF protection. Version 2.2.15 contains a patch for the issue. No known workarounds are available.","aliases":["GHSA-rw54-6826-c8j5"],"modified":"2026-08-12T03:51:14.408619688Z","published":"2023-12-22T18:30:03.118Z","database_specific":{"cwe_ids":["CWE-347","CWE-918"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/50xxx/CVE-2023-50714.json","cna_assigner":"GitHub_M"},"references":[{"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"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/50xxx/CVE-2023-50714.json"},{"type":"ADVISORY","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":"FIX","url":"https://github.com/yiisoft/yii2-authclient/commit/721ed974bc44137437b0cdc8454e137fff8db213"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/yiisoft/yii2-authclient","events":[{"introduced":"0"},{"fixed":"a11cbb065a2424c25f9dc0d0df6852d605d869b2"},{"fixed":"721ed974bc44137437b0cdc8454e137fff8db213"}],"database_specific":{"cpe":"cpe:2.3:a:yiiframework:yii2-authclient:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"2.2.15"}],"source":["CPE_RANGE","REFERENCES"]}}],"versions":["2.2.14","2.2.13","2.2.12","2.2.11","2.2.10","2.2.9","2.2.8","2.2.7","2.2.6","2.2.4","2.2.3","2.2.2","2.2.1","2.2.0","2.1.8","2.1.7","2.1.6","2.1.5","2.1.4","2.1.3","2.1.2","2.1.1","2.1.0","2.0.6","2.0.5","2.0.4","2.0.3","2.0.2","2.0.1","2.0.0","2.0.0-rc","2.0.0-beta"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-50714.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"}]}