Vulnerability-Lookup

GHSA-XQ8M-7C5P-C2R6

Vulnerability from github – Published: 2026-04-21 15:21 – Updated: 2026-04-21 15:21

Summary

Auth0 Next.js SDK has Improper Proxy Cache Lookup

Details

Description

In affected versions of the Next.js SDK, simultaneous requests that trigger a nonce retry may cause the proxy cache fetcher to perform improper lookups for the token request results.

Which Projects are Affected?

Users are affected if they meet all of the following preconditions: - Applications using the auth0/nextjs-auth0 SDK, versions 4.12.0 to 4.17.0, and - Applications using the proxy handler /me/ and /my-org/ with DPoP enabled.

Affected product and versions

Auth0/nextjs-auth0 v4.12.0 to 4.17.0

Resolution

Upgrade Auth0/nextjs-auth0 version to v4.18.0 or greater

Acknowledgements

Okta would like to thank Reynaldo Immanuel for their discovery and responsible disclosure.

Severity

5.4 (Medium)


                  
                    CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N

Show details on source website

JSON

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.17.0"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@auth0/nextjs-auth0"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.12.0"
            },
            {
              "fixed": "4.18.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-40155"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362",
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-21T15:21:46Z",
    "nvd_published_at": "2026-04-17T21:16:33Z",
    "severity": "MODERATE"
  },
  "details": "### Description\nIn affected versions of the Next.js SDK, simultaneous requests that trigger a nonce retry may cause the proxy cache fetcher to perform improper lookups for the token request results.\n\n### Which Projects are Affected?\nUsers are affected if they meet all of the following preconditions:\n- Applications using the auth0/nextjs-auth0 SDK, versions 4.12.0 to 4.17.0, and\n- Applications using the proxy handler  /me/* and /my-org/* with DPoP enabled.\n\n\n### Affected product and versions\nAuth0/nextjs-auth0 v4.12.0 to 4.17.0\n\n### Resolution\nUpgrade Auth0/nextjs-auth0 version to v4.18.0 or greater\n\n### Acknowledgements\nOkta would like to thank Reynaldo Immanuel for their discovery and responsible disclosure.",
  "id": "GHSA-xq8m-7c5p-c2r6",
  "modified": "2026-04-21T15:21:46Z",
  "published": "2026-04-21T15:21:46Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-xq8m-7c5p-c2r6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40155"
    },
    {
      "type": "WEB",
      "url": "https://github.com/auth0/nextjs-auth0/commit/98c36dc306970c2230ea1a32efef431d29b99978"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/auth0/nextjs-auth0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/auth0/nextjs-auth0/releases/tag/v4.18.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Auth0 Next.js SDK has Improper Proxy Cache Lookup"
}

CVE-2026-40155 (GCVE-0-2026-40155)

Vulnerability from cvelistv5 – Published: 2026-04-17 20:54 – Updated: 2026-04-20 14:57

Title

Auth0 Next.js SDK has Improper Proxy Cache Lookup

Summary

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.

Severity

5.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-20 14:51 UTC

CWE

CWE-863 - Incorrect Authorization
CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/auth0/nextjs-auth0/security/ad…	x_refsource_CONFIRM
https://github.com/auth0/nextjs-auth0/commit/98c3…	x_refsource_MISC
https://github.com/auth0/nextjs-auth0/releases/ta…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
auth0	nextjs-auth0	Affected: >= 4.12.0, < 4.18.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-40155",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-20T14:51:32.552302Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-20T14:57:32.023Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "nextjs-auth0",
          "vendor": "auth0",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 4.12.0, \u003c 4.18.0"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-362",
              "description": "CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-17T20:54:38.958Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "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"
        }
      ],
      "source": {
        "advisory": "GHSA-xq8m-7c5p-c2r6",
        "discovery": "UNKNOWN"
      },
      "title": "Auth0 Next.js SDK has Improper Proxy Cache Lookup"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-40155",
    "datePublished": "2026-04-17T20:54:38.958Z",
    "dateReserved": "2026-04-09T19:31:56.013Z",
    "dateUpdated": "2026-04-20T14:57:32.023Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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