CVE-2025-55009 AuthKit: Sensitive auth data rendered in HTML
The AuthKit library for Remix leaks sensitive session and access tokens into browser HTML, allowing attackers to steal authentication data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-55009?
CVE-2025-55009 is a high-severity vulnerability in workos authkit-remix, published on 9 Aug 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The AuthKit library for Remix provides convenient helpers for authentication and session management using WorkOS & AuthKit with Remix. In versions 0.14.1 and below, @workos-inc/authkit-remix exposed sensitive authentication artifacts — specifically sealedSession and accessToken — by returning them from the authkitLoader. This caused them to be rendered into the browser HTML.
Weakness: CWE-200
Which versions are affected by CVE-2025-55009?
2 open source packages ship an affected version, including @workos-inc/authkit-remix.
| Package | Affected | Fixed in |
|---|---|---|
@workos-inc/authkit-remix npm | All versions | 0.15.0 |
@workos-inc/authkit-remix npm | All versions | 0.15.0 |
How do I fix CVE-2025-55009?
Upgrade @workos-inc/authkit-remix to 0.15.0 or later.
Is CVE-2025-55009 being exploited?
There is no known exploitation of CVE-2025-55009 in the wild and no public exploit code.
Sources
Also known as GHSA-v3gr-w9gf-23cx.