CVE-2026-41164

MEDIUM

nuts-node: JWT type confusion in v1 access token introspection allows VP replay as access token

Title source: cna
STIX 2.1

Description

nuts-node is the reference implementation of the Nuts specification. Prior to 6.2.3 and 5.4.31, the v1 access token introspection endpoint (/auth/v1/introspect_access_token) accepts any JWT signed by a key present on the node, without validating the JWT type, issuer-to-key binding, or required claims. This allows a Verifiable Presentation (VP) JWT to be replayed as an access token and receive an active: true introspection response. This vulnerability is fixed in 6.2.3 and 5.4.31.

References (1)

Core 1
Core References

Scores

CVSS v3 4.4
EPSS 0.0008
EPSS Percentile 0.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-345
Status published
Products (3)
nuts-foundation/nuts-node 0 - 1.1.0Go
nuts-foundation/nuts-node < 5.4.31
nuts-foundation/nuts-node >= 6.0.0-alpha.1, < 6.2.3
Published May 26, 2026
Tracked Since May 26, 2026