CVE-2026-41164
nuts-node: JWT type confusion in v1 access token introspection allows VP replay as access token
CVSS Score
4.4
EPSS Score
0.0%
EPSS Percentile
3th
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.
| CWE | CWE-345 |
| Vendor | nuts-foundation |
| Product | nuts-node |
| Published | May 26, 2026 |
| Last Updated | May 27, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
nuts-foundation / nuts-node
>= 6.0.0-alpha.1, < 6.2.3 < 5.4.31