CVE-2026-42280 (GCVE-0-2026-42280)

Vulnerability from cvelistv5 – Published: 2026-05-27 14:39 – Updated: 2026-05-27 14:39
VLAI
Title
Improper Permission Checking in Auth.js SDK
Summary
Auth0.js is a client-side JavaScript library for Auth0. From 8.11.0 to 9.32.0, under specific preconditions, the Auth0.js SDK may improperly return user profile information using a valid access token when a specifically crafted invalid ID token is provided. This vulnerability is fixed in 10.0.0.
Severity
7.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
CWE
  • CWE-863 - Incorrect Authorization
Assigner
References
Impacted products
Vendor Product Version
auth0 auth0.js Affected: >= 8.11.0 , <= 9.32.0
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        {
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          "vendor": "auth0",
          "versions": [
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        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
            "version": "3.1"
          }
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      "problemTypes": [
        {
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            {
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              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
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            }
          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T14:39:15.789Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
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        }
      ],
      "source": {
        "advisory": "GHSA-8qjv-jj2q-x832",
        "discovery": "UNKNOWN"
      },
      "title": "Improper Permission Checking in Auth.js SDK"
    }
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  "cveMetadata": {
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    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-42280",
    "datePublished": "2026-05-27T14:39:15.789Z",
    "dateReserved": "2026-04-26T11:53:27.717Z",
    "dateUpdated": "2026-05-27T14:39:15.789Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.