CVE-2026-75509

MediumCVSS 6.5/10Last modified Oct 12, 2026

Description

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to version 1.7.3, JWTClaimsRegistry applies membership matching to list-valued iss and sub claims, allowing an array-valued iss that contains the expected issuer to pass an intended equality check and enabling issuer-validation bypass. This issue is fixed in version 1.7.3.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

Weakness enumeration

CWE-290 CWE-345

Affected software

No affected versions have been published.

Timeline

Published: Aug 24, 2026
Last modified: Oct 12, 2026
NVD status: Deferred

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