CVE-2023-50708: Yiiframework YII2-Authclient

Critical severity, CVSS 9.8. EPSS: 0.7% chance of exploitation in the next 30 days.

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 Oauth1/2 `state` and OpenID Connect `nonce` is vulnerable for a `timing attack` since it is compared via regular string comparison (instead of `Yii::$app->getSecurity()->compareString()`). Version 2.2.15 contains a patch for the issue. No known workarounds are available.

Affected products

• Yiiframework YII2-Authclient: before 2.2.15 (fixed in 2.2.15)

Published 2023-12-22. Last modified 2026-06-17.