{"id":"CVE-2026-41164","state":"PUBLISHED","title":"nuts-node: JWT type confusion in v1 access token introspection allows VP replay as access token","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.","publishedAt":"2026-05-26T17:35:59.019Z","updatedAt":"2026-05-27T17:24:40.295Z","severity":{"score":4.4,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["nuts-foundation nuts-node"],"affected":[{"vendor":"nuts-foundation","product":"nuts-node","versions":[{"version":">= 6.0.0-alpha.1, < 6.2.3","status":"affected"},{"version":"< 5.4.31","status":"affected"}]}],"references":["https://github.com/nuts-foundation/nuts-node/security/advisories/GHSA-9hmg-827w-9rhj"],"weaknesses":["CWE-345"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/41xxx/CVE-2026-41164.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-41164","state":"PUBLISHED","datePublished":"2026-05-26T17:35:59.019Z","dateUpdated":"2026-05-27T17:24:40.295Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-17T16:34:45.525Z"},"containers":{"cna":{"title":"nuts-node: JWT type confusion in v1 access token introspection allows VP replay as access token","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"nuts-foundation","product":"nuts-node","versions":[{"version":">= 6.0.0-alpha.1, < 6.2.3","status":"affected"},{"version":"< 5.4.31","status":"affected"}]}],"references":[{"url":"https://github.com/nuts-foundation/nuts-node/security/advisories/GHSA-9hmg-827w-9rhj","name":"https://github.com/nuts-foundation/nuts-node/security/advisories/GHSA-9hmg-827w-9rhj","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-345","lang":"en","description":"CWE-345: Insufficient Verification of Data Authenticity","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-26T17:35:59.019Z"},"source":{"advisory":"GHSA-9hmg-827w-9rhj","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-27T17:24:32.828628Z","id":"CVE-2026-41164","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-27T17:24:40.295Z"}}]}}}