{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-40155", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-09T19:31:56.013Z", "datePublished": "2026-04-17T20:54:38.958Z", "dateUpdated": "2026-04-17T20:54:38.958Z"}, "containers": {"cna": {"title": "Auth0 Next.js SDK has Improper Proxy Cache Lookup", "problemTypes": [{"descriptions": [{"cweId": "CWE-863", "lang": "en", "description": "CWE-863: Incorrect Authorization", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-362", "lang": "en", "description": "CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-xq8m-7c5p-c2r6", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-xq8m-7c5p-c2r6"}, {"name": "https://github.com/auth0/nextjs-auth0/commit/98c36dc306970c2230ea1a32efef431d29b99978", "tags": ["x_refsource_MISC"], "url": "https://github.com/auth0/nextjs-auth0/commit/98c36dc306970c2230ea1a32efef431d29b99978"}, {"name": "https://github.com/auth0/nextjs-auth0/releases/tag/v4.18.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/auth0/nextjs-auth0/releases/tag/v4.18.0"}], "affected": [{"vendor": "auth0", "product": "nextjs-auth0", "versions": [{"version": ">= 4.12.0, < 4.18.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-04-17T20:54:38.958Z"}, "descriptions": [{"lang": "en", "value": "The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. In versions 4.12.0 through 4.17.1, simultaneous requests that trigger a nonce retry may cause the proxy cache fetcher to perform improper lookups for the token request results. Users are affected if their project uses both the vulnerable versions and the proxy handler /me/* and /my-org/* with DPoP enabled. This issue has been fixed in version 4.18.0."}], "source": {"advisory": "GHSA-xq8m-7c5p-c2r6", "discovery": "UNKNOWN"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. In versions 4.12.0 through 4.17.1, simultaneous requests that trigger a nonce retry may cause the proxy cache fetcher to perform improper lookups for the token request results. Users are affected if their project uses both the vulnerable versions and the proxy handler /me/* and /my-org/* with DPoP enabled. This issue has been fixed in version 4.18.0."}], "id": "CVE-2026-40155", "lastModified": "2026-04-17T21:16:33.713", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 1.2, "impactScore": 4.2, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-04-17T21:16:33.713", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/auth0/nextjs-auth0/commit/98c36dc306970c2230ea1a32efef431d29b99978"}, {"source": "security-advisories@github.com", "url": "https://github.com/auth0/nextjs-auth0/releases/tag/v4.18.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-xq8m-7c5p-c2r6"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}, {"lang": "en", "value": "CWE-863"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.12.0,4.18.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "nextjs-auth0", "source": "cna", "vendor": "auth0"}, "product": "nextjs-auth0", "vendor": "auth0"}], "created": "2026-04-17T22:30:29.501240+00:00", "updated": "2026-04-17T22:30:29.501272+00:00", "vendors": ["auth0", "auth0$PRODUCT$nextjs-auth0"]}