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    CVE-2026-28802

    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.

    Published:Mar 6, 2026
    Last Modified:Apr 16, 2026
    EPS:Mar 6, 2026
    EPSS Score:0.00024
    CVSS Score:9.8

    Affected Products

    Vendor
    Authlib
    Product
    Authlib

    Exploits

    https://github.com/authlib/authlib/security/advisories/GHSA-7wc2-qxgw-g8gg

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-463 Padding Oracle Crypto Attack
    CAPEC-475 Signature Spoofing by Improper Validation

    Related CVEs

    CVE-2026-41479 (CVSS 5.4) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.10 and 1.7.1, Authlib'…
    CVE-2026-44681 (CVSS 6.1) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.12 and 1.7.1, an unaut…
    CVE-2026-41425 (CVSS 5.4) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.11, there is no CSRF p…
    CVE-2026-28498 (CVSS 8.2) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a library-l…
    CVE-2026-28490 (CVSS 8.3) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a cryptogra…
    CVE-2026-27962 (CVSS 9.1) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a JWK Heade…
    CVE-2025-68158 (CVSS 5.7) — Authlib is a Python library which builds OAuth and OpenID Connect servers. In versions 1.0.0 through 1.6.5, ca…
    CVE-2025-62706 (CVSS 6.5) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.5, Authlib’s J…
    CVE-2025-61920 (CVSS 7.5) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.5, Authlib’s J…
    CVE-2025-59420 (CVSS 7.5) — Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.4, Authlib’s J…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High