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CVE-2026-4349 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

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 to initiate the attack remotely. The attack is considered to have high complexity. The exploitability is described as difficult. This vulnerability only affects products that are no longer supported by the maintainer.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:4.2 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

CNA: [email protected]CVSS-B:5.6 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://vuldb.com/?ctiid.351380	[email protected]	AdvisoryPermission Required
https://vuldb.com/?id.351380	[email protected]	AdvisoryBundleTechnical Description
https://vuldb.com/?submit.772071	[email protected]	ExploitTechnical Description

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-287	Improper Authentication	[email protected]

Affected Products

Product	Versions
Duende IdentityServer 4	4
CPE cpe:2.3:a:identityserver:identityserver4:::::::: Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Mar 25, 2026	CVE Modified	[email protected]
Mar 17, 2026	New CVE Received	[email protected]