nuts-foundation nuts-node up to 5.4.30/6.2.2 Token Introspection Endpoint introspect_access_token data authenticity

Summaryinfo

A vulnerability was found in nuts-foundation nuts-node up to 5.4.30/6.2.2. It has been classified as problematic. Affected by this vulnerability is an unknown functionality of the file /auth/v1/introspect_access_token of the component Token Introspection Endpoint. The manipulation leads to data authenticity. This vulnerability is listed as CVE-2026-41164. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in nuts-foundation nuts-node up to 5.4.30/6.2.2 and classified as problematic. This issue affects an unknown code block of the file /auth/v1/introspect_access_token of the component Token Introspection Endpoint. The manipulation with an unknown input leads to a data authenticity vulnerability. Using CWE to declare the problem leads to CWE-345. The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-41164 since 04/17/2026. The exploitation is known to be difficult. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 5.4.31 or 6.2.3 eliminates this vulnerability.

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Productinfo

Vendor

• nuts-foundation

Name

• nuts-node

Version

• 5.4.0
• 5.4.1
• 5.4.2
• 5.4.3
• 5.4.4
• 5.4.5
• 5.4.6
• 5.4.7
• 5.4.8
• 5.4.9
• 5.4.10
• 5.4.11
• 5.4.12
• 5.4.13
• 5.4.14
• 5.4.15
• 5.4.16
• 5.4.17
• 5.4.18
• 5.4.19
• 5.4.20
• 5.4.21
• 5.4.22
• 5.4.23
• 5.4.24
• 5.4.25
• 5.4.26
• 5.4.27
• 5.4.28
• 5.4.29
• 5.4.30
• 6.2.0
• 6.2.1
• 6.2.2

Website

• Product: https://github.com/nuts-foundation/nuts-node/

CPE 2.3info

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CPE 2.2info

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