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VULNERABILITIES

CVE-2026-75509 Details

UNDERGOING ENRICHMENT

The CVE is currently being enriched by the Volerion team. The enrichment process results in the association of reference link tags, CVSS, and CPE applicability statement data.

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.x Severity and Vector Strings:

NDDVolerionCVSS-B:…Vector:This vulnerability is currently being analyzed.
CNA: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/authlib/joserfc/security/advisories/GHSA-r74j-q665-7rpj CISA-ADP
https://github.com/authlib/joserfc/commit/76ee6a59bf5773c0af00b99076c5e199031f97f1 [email protected]
https://github.com/authlib/joserfc/security/advisories/GHSA-r74j-q665-7rpj [email protected]

Weakness Enumeration

CWE-IDCWE NameSource
CWE-290Authentication Bypass by Spoofing[email protected]
CWE-345Insufficient Verification of Data Authenticity[email protected]

Affected Products

This vulnerability is currently being analyzed

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-75509
NVD Published Date:
Aug 24, 2026
NVD Last Modified:
Sep 9, 2026
Source:
[email protected]
CVE-2026-75509 Details - Not Deferred