CVE-2026-42565 json
@workos/authkit-session: Open Redirect via state-derived redirect target
published 2026-05-05 6 mo ago modified 2026-10-26 13 d ago also GHSA-vvvv-983w-r7pv , EUVD-2026-29181
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 9%
- public exploits
- 0
- none known
Summary
@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.
Patch / fix
- npm @workos/authkit-session 0.5.1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.19% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N |
| GitHub | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | @workos/authkit-session | <0.5.1 |
0.5.1 |
Affected products
- workos authkit-session
Classification
- Weakness
-
- CWE-601 URL Redirection to Untrusted Site
References
-
github.com
/workos/authkit-session/commit/f56e1d6214a93160759e5677b7a3d772b244db39
web
-
github.com
/workos/authkit-session/security/advisories/GHSA-vvvv-983w-r7pv
web
-
github.com
/workos/authkit-session/releases/tag/v0.5.1
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-42565
advisory
-
github.com
/workos/authkit-session
package
Sources
- CVE List CVE-2026-42565
- GitHub Advisory GHSA-vvvv-983w-r7pv
- NVD CVE-2026-42565
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