@workos/authkit-session has an Open Redirect via state-derived redirect target — CVE-2026-42565

Summary

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,…

Product

npm: @workos/authkit-session

What to do

General, cautious steps (verify details in the official source):

• Review exposure and plan remediation based on risk and environment.
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

Related advisories