CVE-2026-42565
MediumCVSS 4.3Exploitation Probability (EPSS)
Low risk9th percentile - higher than 9% of all known CVEs
Summary
In @workos/authkit-session prior to 0.5.1, an open redirect vulnerability exists in AuthService.handleCallback due to insufficient validation of the returnPathname value derived from the OAuth state parameter. The state parameter is round-tripped through the identity provider (IdP) and can be influenced by an attacker; handleCallback decodes and returns returnPathname without enforcing restrictions on origin or scheme, potentially redirecting the user to an external attacker-controlled site.
Risk Assessment
An attacker can redirect the user to a malicious site, potentially leading to phishing or credential theft. This undermines trust in the login process.
Recommendation
Update @workos/authkit-session to version 0.5.1 or later. Ensure the application validates returnPathname before using it in a redirect.
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Original NVD description (English source)
@workos/authkit-session is a toolkit for building WorkOS AuthKit framework integrations. Prior to 0.5.1, an open redirect vulnerability exists in AuthService.handleCallback due to insufficient validation of the returnPathname value derived from the OAuth state parameter. The state parameter is round-tripped through the identity provider (IdP) and can be influenced by an attacker. The handleCallback function decodes and returns returnPathname without enforcing restrictions on origin or scheme. As a result, attacker-controlled values may be returned to the application. If this value is used directly in a redirect, it may cause the user to be redirected to an external, attacker-controlled site. This vulnerability is fixed in 0.5.1.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

