Duende vulnerabilities

Products

• IdentityServer4 1

Latest Duende CVEs

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1. CVE-2026-4349 Duende IdentityServer4 Token Renewal Endpoint authorize improper authentication

   Published 2026-03-17

   Medium·CVSS 6.3 EPSS 0.46%

   A vulnerability was determined in Duende IdentityServer4 up to 4.1.2. The affected element is an unknown function of the file /connect/authorize of the component Token Renewal Endpoint. This manipulation of the argument id_token_hint causes improper authentication. It is possible...

Sources: CVE.org, NVD, CISA KEV, FIRST EPSS, OSV and public exploit-reference metadata. Product matching comes from the published CVE records. A proof-of-concept means public code exists; it is not evidence of exploitation.