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The AuthKit React Router Library rendered sensitive auth data in HTML

High severity GitHub Reviewed Published Aug 8, 2025 in workos/authkit-react-router • Updated Aug 11, 2025

Package

npm @workos-inc/authkit-react-router (npm)

Affected versions

< 0.7.0

Patched versions

0.7.0

Description

In versions before 0.7.0, @workos-inc/authkit-react-router 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

This information disclosure 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-react-router/releases/tag/v0.7.0

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.

References

@marji-workos marji-workos published to workos/authkit-react-router Aug 8, 2025
Published to the GitHub Advisory Database Aug 8, 2025
Reviewed Aug 8, 2025
Published by the National Vulnerability Database Aug 9, 2025
Last updated Aug 11, 2025

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

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(22nd percentile)

Weaknesses

Exposure of Sensitive Information to an Unauthorized Actor

The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Learn more on MITRE.

CVE ID

CVE-2025-55008

GHSA ID

GHSA-vqvc-9q8x-vmq6

Source code

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