CVE-2026-41164: CWE-345: Insufficient Verification of Data Authenticity in nuts-foundation nuts-node
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.
AI Analysis
Technical Summary
nuts-node versions before 6.2.3 and 5.4.31 have insufficient verification of data authenticity in the /auth/v1/introspect_access_token endpoint. Specifically, the endpoint accepts any JWT signed by a key on the node without validating the JWT type, issuer-to-key binding, or required claims. This allows an attacker to replay a Verifiable Presentation JWT as an access token, causing the introspection endpoint to incorrectly respond that the token is active. This vulnerability is classified under CWE-345 (Insufficient Verification of Data Authenticity).
Potential Impact
An attacker can replay a Verifiable Presentation JWT as an access token and receive an active: true response from the introspection endpoint. This could lead to improper authorization decisions based on invalid tokens. The CVSS score of 4.4 reflects a medium severity with limited impact, requiring network access with high attack complexity and low privileges with user interaction. There is no indication of known exploits in the wild.
Mitigation Recommendations
This vulnerability is fixed in nuts-node versions 6.2.3 and 5.4.31. Users should upgrade to these or later versions to remediate the issue. Patch status is not explicitly stated beyond the fixed versions, so users should consult the vendor's official advisories for the latest remediation guidance.
CVE-2026-41164: CWE-345: Insufficient Verification of Data Authenticity in nuts-foundation nuts-node
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.
CVSS v3.1
Score 4.4medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
nuts-node versions before 6.2.3 and 5.4.31 have insufficient verification of data authenticity in the /auth/v1/introspect_access_token endpoint. Specifically, the endpoint accepts any JWT signed by a key on the node without validating the JWT type, issuer-to-key binding, or required claims. This allows an attacker to replay a Verifiable Presentation JWT as an access token, causing the introspection endpoint to incorrectly respond that the token is active. This vulnerability is classified under CWE-345 (Insufficient Verification of Data Authenticity).
Potential Impact
An attacker can replay a Verifiable Presentation JWT as an access token and receive an active: true response from the introspection endpoint. This could lead to improper authorization decisions based on invalid tokens. The CVSS score of 4.4 reflects a medium severity with limited impact, requiring network access with high attack complexity and low privileges with user interaction. There is no indication of known exploits in the wild.
Mitigation Recommendations
This vulnerability is fixed in nuts-node versions 6.2.3 and 5.4.31. Users should upgrade to these or later versions to remediate the issue. Patch status is not explicitly stated beyond the fixed versions, so users should consult the vendor's official advisories for the latest remediation guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-17T16:34:45.525Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a15e037891d628fdc67d8b5
Added to database: 5/26/2026, 6:02:31 PM
Last enriched: 5/26/2026, 6:32:50 PM
Last updated: 5/26/2026, 9:53:43 PM
Views: 8
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