CVE-2026-4349

MEDIUM EPSS 32.5%

Published Mar 17, 20263mo ago · Modified Jun 17, 20261w ago

6.3 CVSS 4.0

Medium

Published Mar 17, 2026 3mo ago

Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score

6.3

Exploitability

—

Impact

—

Vector string

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector Network

Attack Complexity High

Privileges Required None

User Interaction None

Scope X

Threat Intelligence

EPSS Exploit Probability

32.5% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-287 Improper Authentication Authentication

References 3

vuldb.com https://vuldb.com/?ctiid.351380
vuldb.com https://vuldb.com/?id.351380
vuldb.com https://vuldb.com/?submit.772071

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.