CVE-2026-4349

6.3 mediumEPSS 0.4%

Medium (6.3). EPSS 0.4% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

6.3 medium

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

CVSS 3.1

5.6 medium

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 36% of CVEs (scores of 2026-10-31)
CWE: CWE-287
Published: 2026-03-17
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

References

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

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