CVE-2023-50714

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    CVE-2023-50714

    Published: 22 Dec 2023Last Modified: 12 Aug 2026

    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.

    References: https://github.com/yiisoft/yii2-authclient/blob/0d1c3880f4d79e20aa1d77c012650b54e69695ff/src/OAuth1.php#L158, https://github.com/yiisoft/yii2-authclient/blob/0d1c3880f4d79e20aa1d77c012650b54e69695ff/src/OAuth2.php#L121, https://github.com/yiisoft/yii2-authclient/blob/0d1c3880f4d79e20aa1d77c012650b54e69695ff/src/OpenIdConnect.php#L420, https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/50xxx/CVE-2023-50714.json, https://github.com/yiisoft/yii2-authclient/security/advisories/GHSA-rw54-6826-c8j5, https://nvd.nist.gov/vuln/detail/CVE-2023-50714, https://github.com/yiisoft/yii2-authclient/commit/721ed974bc44137437b0cdc8454e137fff8db213

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -a11cbb065a2424c25f9dc0d0df6852d605d869b2

    Affected 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

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2023-50714 | CVE-DB