MEDIUMVulnerability
CVE-2026-75509
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.
Properties
- severity
- MEDIUM
- score
- 6.5
- cve_id
- CVE-2026-75509
- signal_observed_at
- 2026-09-15T17:14:34+00:00
- vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
- published_at
- 2026-08-24T20:17:19.183
- last_modified
- 2026-09-09T21:06:39.057
Related Entities (3)
HAS_WEAKNESS (2)
→[Weakness]Insufficient Verification of Data Authenticity
→[Weakness]Authentication Bypass by Spoofing
DESCRIBED_BY (1)
→[Source]NVD
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