Vulnerabilities CVE-2026-28802

CVE-2026-28802

High

Open

TLP:CLEAR

Authlib: Setting `alg: none` and a blank signature appears to bypass signature verification

NVD CVE.org

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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.

Details

CVSS Score: 7.7
EPSS Score ⓘ: 0.43%

35.2th percentile
CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
Confidence: 90%
Published: Mar 6, 2026
Last Modified: Aug 12, 2026

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