Open Redirect Affecting @workos/authkit-session package, versions <0.5.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-WORKOSAUTHKITSESSION-16425670
- published6 May 2026
- disclosed5 May 2026
- creditkenkunz
Introduced: 5 May 2026
NewCVE-2026-42565 (opens in a new tab)How to fix?
Upgrade @workos/authkit-session to version 0.5.1 or higher.
Overview
@workos/authkit-session is a Framework-agnostic authentication library for WorkOS with pluggable storage adapters
Affected versions of this package are vulnerable to Open Redirect via the handleCallback function when processing the returnPathname value derived from the OAuth state parameter. An attacker can redirect users to an external, attacker-controlled site by crafting a malicious authentication flow and influencing the state parameter. This is only exploitable if the application uses returnPathname as a redirect target without downstream validation or allowlisting.