{"id":"CVE-2023-50708","aliases":["GHSA-w8vh-p74j-x9xp"],"url":"https://o3.security/vulnerability/CVE-2023-50708","summary":"yii2-authclient vulnerable to possible timing attack on string comparison in OAuth1, OAuth2 and OpenID Connect implementation","details":"### Impact\n_What kind of vulnerability is it? Who is impacted?_\n\nOriginal Report:\n\n> The Oauth1/2 \"state\" and OpenID Connect \"nonce\" is vulnerable for a \"timing attack\" since it's compared via regular string \n> comparison (instead of `Yii::$app->getSecurity()->compareString()`).\n\nAffected Code:\n\n1. OAuth 1 \"state\"\n\n    https://github.com/yiisoft/yii2-authclient/blob/0d1c3880f4d79e20aa1d77c012650b54e69695ff/src/OAuth1.php#L158\n\n3. OAuth 2 \"state\"\n    \n    https://github.com/yiisoft/yii2-authclient/blob/0d1c3880f4d79e20aa1d77c012650b54e69695ff/src/OAuth2.php#L121\n\n4. OpenID Connect \"nonce\"\n    \n    https://github.com/yiisoft/yii2-authclient/blob/0d1c3880f4d79e20aa1d77c012650b54e69695ff/src/OpenIdConnect.php#L420\n\n\n### Patches\n_Has the problem been patched? What versions should users upgrade to?_\n\nTBD: Replace strcmp with  `Yii::$app->getSecurity()->compareString()`).\n\n### Workarounds\n_Is there a way for users to fix or remediate the vulnerability without upgrading?_\n\nnot as far as I see.\n\n### References\n_Are there any links users can visit to find out more?_\n","published":"2023-12-22T18:25:01.925Z","modified":"2026-10-28T02:30:46.727814120Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"Packagist","name":"yiisoft/yii2-authclient","fixedVersion":"2.2.15"}],"fix":{"url":"https://github.com/yiisoft/yii2-authclient/commit/dabddf2154ab7e7703740205a069202554089248","label":"yiisoft/yii2-authclient@dabddf2"},"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-2023-50708.json"},{"type":"ADVISORY","url":"https://github.com/yiisoft/yii2-authclient/security/advisories/GHSA-w8vh-p74j-x9xp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-50708"},{"type":"FIX","url":"https://github.com/yiisoft/yii2-authclient/commit/dabddf2154ab7e7703740205a069202554089248"},{"type":"PACKAGE","url":"https://github.com/yiisoft/yii2-authclient"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:46.727814120Z"}}