What is CVE-2026-42565?

CVE-2026-42565 is a medium-severity vulnerability in Workos Authkit-session, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.3/10. Published 2026-05-11.

How severe is CVE-2026-42565?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Open Redirect in Workos Authkit-session

CVE-2026-42565

@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…

Vulnerability class: Open Redirect

EPSS: 0.000 (8.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

Affected products

Workos Authkit-session — versions < 0.5.1

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-42565?: CVE-2026-42565 is a medium-severity vulnerability in Workos Authkit-session, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.3/10. Published 2026-05-11.
How severe is CVE-2026-42565?: Medium severity. CVSS v3 base score is 4.3 out of 10.