VULNERABILITY INTELLIGENCE

CVE-2026-28802

CVSS score9.8 CRITICAL
EPSS probability0.50%
CISA KEVNot currently listed
Published2026-03-06
Last modified2026-09-10
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

Authlib is a Python library which builds OAuth and OpenID Connect servers. From version 1.6.5 to before version 1.6.7, previous tests involving passing a malicious JWT containing alg: none and an empty signature was passing the signature verification step without any changes to the application code when a failure was expected.. This issue has been patched in version 1.6.7.

Weakness classification

  • security-advisories@github.com: CWE-347
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-347

Primary references