EUVD-2026-10442

fkie_cve-2023-50708

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.

GHSA-w8vh-p74j-x9xp — yii2-authclient vulnerable to possible timing attack on string comparison in OAuth1, OAuth2 and OpenID Connect implemen…

Affected: Packagist: yiisoft/yii2-authclient

### Impact _What kind of vulnerability is it? Who is impacted?_

Original Report:

> The Oauth1/2 "state" and OpenID Connect "nonce" is vulnerable for a "timing attack" since it's compared via regular string > comparison (instead of `Yii::$app->getSecurity()->compareString()`).

Affected Code:

1. OAuth 1 "state"

https://github.com/yiisoft/yii2-authclient/blob/0d1c3880f4d79e20aa1d77c012650b54e69695ff/src/OAuth1.php#L158

3. OAuth 2 "state" https://github.com/yiisoft/yii2-authclient/blob/0d1c3880f4d79e20aa1d77c012650b54e69695ff/src/OAuth2.php#L121

4. OpenID Connect "nonce" https://github.com/yiisoft/yii2-authclient/blob/0d1c3880f4d79e20aa1d77c012650b54e69695ff/src/OpenIdConnect.php#L420

### Patches _Has the problem been patched? What versions should users upgrade to?_

TBD: Replace strcmp with `Yii::$app->getSecurity()->compareString()`).

### Workarounds _Is there a way for users to fix or remediate the vulnerability without upgrading?_

not as far as I see.

### References _Are there any links users can visit to find out more?_

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GHSA-w8vh-p74j-x9xp — yii2-authclient vulnerable to possible timing attack on string comparison in OAuth1, OAuth2 and OpenID Connect implemen…

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