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CVE-2026-75509 - joserfc claim-validation bypass via array-typed single-string claims (iss/sub/jti)

CVE ID : CVE-2026-75509 Published : Aug. 24, 2026, 8:17 p. m. • 54 minutes ago 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. Severity: 6.5 • MEDIUM Visit the link for more details, such as CVSS details, affected products, timeline, and more...

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