CVE-2023-50714 The Oauth2 PKCE implementation is vulnerable
Attackers can bypass PKCE protections in the Yii2 OAuth2 extension, potentially enabling CSRF or downgrade attacks if PKCE is relied upon for security.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2023-50714?
CVE-2023-50714 is a medium-severity vulnerability in yiisoft yii2-authclient, published on 22 Dec 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Which versions are affected by CVE-2023-50714?
2 open source packages ship an affected version, including yiisoft/yii2-authclient. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
yiisoft/yii2-authclient Packagist | All versions | 2.2.15 |
yiisoft/yii2-authclient Packagist | All versions | 2.2.15 |
Products include Yiiframework Yii2-Authclient.
How do I fix CVE-2023-50714?
Upgrade yiisoft/yii2-authclient to 2.2.15 or later.
Is CVE-2023-50714 being exploited?
There is no known exploitation of CVE-2023-50714 in the wild and no public exploit code.
Other vulnerabilities in yiisoft yii2-authclient
Sources
Also known as GHSA-rw54-6826-c8j5.