Summary
yii2-authclient vulnerable to possible timing attack on string comparison in OAuth1, OAuth2 and OpenID Connect implementation
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?
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::$app->getSecurity()->compareString()).
Affected Code:
OAuth 1 "state"
OAuth 2 "state"
OpenID Connect "nonce"
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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See it in your environmentNew to Kodem? Get a demo →Remediation advice
Has the problem been patched? What versions should users upgrade to?
TBD: Replace strcmp with Yii::$app->getSecurity()->compareString()).
Frequently Asked Questions
- What is CVE-2023-50708? CVE-2023-50708 is a low-severity security vulnerability in yiisoft/yii2-authclient (composer), affecting versions <= 2.2.14. It is fixed in 2.2.15.
- Which versions of yiisoft/yii2-authclient are affected by CVE-2023-50708? yiisoft/yii2-authclient (composer) versions <= 2.2.14 is affected.
- Is there a fix for CVE-2023-50708? Yes. CVE-2023-50708 is fixed in 2.2.15. Upgrade to this version or later.
- Is CVE-2023-50708 exploitable, and should I be worried? Whether CVE-2023-50708 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2023-50708 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2023-50708? Upgrade
yiisoft/yii2-authclientto 2.2.15 or later.