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CVE-2023-48238: json-web-token library is vulnerable to a JWT algorithm confusion attack

November 17, 2023 (updated June 8, 2026)

The json-web-token library is vulnerable to a JWT algorithm confusion attack.

References

  • github.com/advisories/GHSA-4xw9-cx39-r355
  • github.com/joaquimserafim/json-web-token/blob/acf6a462471e1b14187eb77414e9161b8b7bff7e/index.js
  • github.com/joaquimserafim/json-web-token/commit/b6e56b1346f48432d29133c76b65222ad93956b7
  • github.com/joaquimserafim/json-web-token/security/advisories/GHSA-4xw9-cx39-r355
  • nvd.nist.gov/vuln/detail/CVE-2023-48238

Code Behaviors & Features

Detect and mitigate CVE-2023-48238 with GitLab Dependency Scanning

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Affected versions

All versions before 4.0.0

Fixed versions

  • 4.0.0

Solution

Upgrade to version 4.0.0 or above.

Impact 7.5 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Learn more about CVSS

Weakness

  • CWE-20: Improper Input Validation
  • CWE-345: Insufficient Verification of Data Authenticity

Source file

npm/json-web-token/CVE-2023-48238.yml

Spotted a mistake? Edit the file on GitLab.

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