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Sensitive auth data rendered in HTML

High
marji-workos published GHSA-v3gr-w9gf-23cx Aug 8, 2025

Package

npm @workos-inc/authkit-remix (npm)

Affected versions

<0.15.0

Patched versions

>=0.15.0

Description

In versions before 0.15.0, @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.

Impact

Exposure of these artifacts could lead to session hijacking in environments where cross-site scripting (XSS), malicious browser extensions, or local inspection is possible.

Patches

Patched in https://github.com/workos/authkit-remix/releases/tag/v0.15.0

In patched versions:

  • sealedSession and accessToken are no longer returned by default from the authkitLoader.
  • A secure server-side mechanism is provided to fetch an access token as needed.

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L

CVE ID

CVE-2025-55009

Weaknesses

No CWEs