CVEvulnerability

CVE-2026-75509

6.5 MEDIUM Published 2026-08-24 Modified 2026-10-12 Official page ↗

Status: Deferred
Published: 2026-08-24
Last modified: 2026-10-12
Assigner: [email protected]
CVSS 3.1 ([email protected]): 6.5 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
Weaknesses: CWE-290, CWE-345

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.

Weakness · CWE (2)

CWE-290 Authentication Bypass by Spoofing weakness
CWE-345 Insufficient Verification of Data Authenticity weakness

References

https://github.com/authlib/joserfc/commit/76ee6a59bf5773c0af00b99076c5e199031f97f1 github.com
https://github.com/authlib/joserfc/security/advisories/GHSA-r74j-q665-7rpj github.com
https://github.com/authlib/joserfc/security/advisories/GHSA-r74j-q665-7rpj github.com

CVE-2026-75509

Description

Related

Weakness · CWE (2)

References