CVE-2026-28802CRITICAL 9.8EPSS p25.3%

CVE-2026-28802CVE-2026-28802

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.

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.34% probability of exploitation · percentile 25.3% · 2026-06-19T12:03:05Z
Published2026-03-06
Last modified2026-03-09

Underlying weaknesses· 1

CWE-347

References

  1. https://github.com/authlib/authlib/commit/a61c2acb807496e67f32051b5f1b1d5ccf8f0a75
  2. https://github.com/authlib/authlib/commit/b87c32ed07b8ae7f805873e1c9cafd1016761df7
  3. https://github.com/authlib/authlib/security/advisories/GHSA-7wc2-qxgw-g8gg

1

TypeTargetConfidenceTier
WeaknessImproper Verification of Cryptographic Signaturecwe-3470%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.