CVE-2026-63421 (GCVE-0-2026-63421)

Vulnerability from cvelistv5 – Published: 2026-08-21 20:15 – Updated: 2026-08-21 20:15

Title

Keystone: `graphql.maxTake` bypass with negative `take`

Summary

Keystone is a content management system for Node.js. Prior to 6.5.3, the findMany resolver in packages/core/src/lib/core/queries/resolvers.ts compares the signed take argument directly with graphql.maxTake, allowing a remote unauthenticated GraphQL client to provide a negative take value whose magnitude exceeds the configured bound. The bypass also applies to relationship queries and can return more records than the developer intended, potentially exhausting service resources. This issue is fixed in version 6.5.3.

Severity

7.5 (High)


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

CWE

CWE-20 - Improper Input Validation
CWE-480 - Use of Incorrect Operator

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/keystonejs/keystone/security/a…	x_refsource_CONFIRM
https://github.com/keystonejs/keystone/pull/9859	x_refsource_MISC
https://github.com/keystonejs/keystone/commit/9fb…	x_refsource_MISC
https://github.com/keystonejs/keystone/releases/t…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
keystonejs	keystone	Affected: < 6.5.3	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "keystone",
          "vendor": "keystonejs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 6.5.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Keystone is a content management system for Node.js. Prior to 6.5.3, the findMany resolver in packages/core/src/lib/core/queries/resolvers.ts compares the signed take argument directly with graphql.maxTake, allowing a remote unauthenticated GraphQL client to provide a negative take value whose magnitude exceeds the configured bound. The bypass also applies to relationship queries and can return more records than the developer intended, potentially exhausting service resources. This issue is fixed in version 6.5.3."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-20",
              "description": "CWE-20: Improper Input Validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-480",
              "description": "CWE-480: Use of Incorrect Operator",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-21T20:15:16.459Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/keystonejs/keystone/security/advisories/GHSA-cqmq-8755-7xvh",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/keystonejs/keystone/security/advisories/GHSA-cqmq-8755-7xvh"
        },
        {
          "name": "https://github.com/keystonejs/keystone/pull/9859",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/keystonejs/keystone/pull/9859"
        },
        {
          "name": "https://github.com/keystonejs/keystone/commit/9fb88b246950ce4de754a43fe6416f20403577b1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/keystonejs/keystone/commit/9fb88b246950ce4de754a43fe6416f20403577b1"
        },
        {
          "name": "https://github.com/keystonejs/keystone/releases/tag/@keystone-6/core@6.5.3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/keystonejs/keystone/releases/tag/@keystone-6/core@6.5.3"
        }
      ],
      "source": {
        "advisory": "GHSA-cqmq-8755-7xvh",
        "discovery": "UNKNOWN"
      },
      "title": "Keystone: `graphql.maxTake` bypass with negative `take`"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-63421",
    "datePublished": "2026-08-21T20:15:16.459Z",
    "dateReserved": "2026-07-16T19:20:28.988Z",
    "dateUpdated": "2026-08-21T20:15:16.459Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-63421",
      "date": "2026-08-22",
      "epss": "0.00469",
      "percentile": "0.3888"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-63421\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-08-21T21:17:01.643\",\"lastModified\":\"2026-08-21T21:17:01.643\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Keystone is a content management system for Node.js. Prior to 6.5.3, the findMany resolver in packages/core/src/lib/core/queries/resolvers.ts compares the signed take argument directly with graphql.maxTake, allowing a remote unauthenticated GraphQL client to provide a negative take value whose magnitude exceeds the configured bound. The bypass also applies to relationship queries and can return more records than the developer intended, potentially exhausting service resources. This issue is fixed in version 6.5.3.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"keystonejs\",\"product\":\"keystone\",\"versions\":[{\"version\":\"\u003c 6.5.3\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-20\"},{\"lang\":\"en\",\"value\":\"CWE-480\"}]}],\"references\":[{\"url\":\"https://github.com/keystonejs/keystone/commit/9fb88b246950ce4de754a43fe6416f20403577b1\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/keystonejs/keystone/pull/9859\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/keystonejs/keystone/releases/tag/@keystone-6/core@6.5.3\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/keystonejs/keystone/security/advisories/GHSA-cqmq-8755-7xvh\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}

FKIE_CVE-2026-63421

Vulnerability from fkie_nvd - Published: 2026-08-21 21:17 - Updated: 2026-08-21 21:17

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/keystonejs/keystone/commit/9fb88b246950ce4de754a43fe6416f20403577b1
	security-advisories@github.com	https://github.com/keystonejs/keystone/pull/9859
	security-advisories@github.com	https://github.com/keystonejs/keystone/releases/tag/@keystone-6/core@6.5.3
	security-advisories@github.com	https://github.com/keystonejs/keystone/security/advisories/GHSA-cqmq-8755-7xvh

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "keystone",
          "vendor": "keystonejs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 6.5.3"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Keystone is a content management system for Node.js. Prior to 6.5.3, the findMany resolver in packages/core/src/lib/core/queries/resolvers.ts compares the signed take argument directly with graphql.maxTake, allowing a remote unauthenticated GraphQL client to provide a negative take value whose magnitude exceeds the configured bound. The bypass also applies to relationship queries and can return more records than the developer intended, potentially exhausting service resources. This issue is fixed in version 6.5.3."
    }
  ],
  "id": "CVE-2026-63421",
  "lastModified": "2026-08-21T21:17:01.643",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-21T21:17:01.643",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/keystonejs/keystone/commit/9fb88b246950ce4de754a43fe6416f20403577b1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/keystonejs/keystone/pull/9859"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/keystonejs/keystone/releases/tag/@keystone-6/core@6.5.3"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/keystonejs/keystone/security/advisories/GHSA-cqmq-8755-7xvh"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        },
        {
          "lang": "en",
          "value": "CWE-480"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

GHSA-CQMQ-8755-7XVH

Vulnerability from github – Published: 2026-08-21 20:55 – Updated: 2026-08-21 20:55

Summary

Keystone vulnerable to `graphql.maxTake` bypass with negative `take`

Details

Summary

The value of graphql.maxTake can be bypassed by providing a negative input. This can be used to exceed the developer's intended graphql.maxTake value, allowing queries to return results in excess of the graphql.maxTake value set.

Impact

This affects any project relying on graphql.maxTake to bound the number of items returned per query.

Patches

This issue has been patched in @keystone-6/core version 6.5.3.

If you cannot patch, you can workaround this by restricting take input values in your GraphQL queries to the bounded value, or by blocking negative values.

Credit

This issue was found by Haxset's Security Scanner and validated by their team.

Severity

7.5 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 6.5.2"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@keystone-6/core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.5.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-63421"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20",
      "CWE-480"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-21T20:55:11Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "# Summary\nThe value of `graphql.maxTake` can be bypassed by providing a negative input.\nThis can be used to exceed the developer\u0027s intended `graphql.maxTake` value, allowing queries to return results in excess of the `graphql.maxTake` value set.\n\n# Impact\nThis affects any project relying on `graphql.maxTake` to bound the number of items returned per query.\n\n# Patches\nThis issue has been patched in `@keystone-6/core` version `6.5.3`.\n\nIf you cannot patch, you can workaround this by restricting `take` input values in your GraphQL queries to the bounded value, or by blocking negative values.\n\n# Credit\nThis issue was found by [Haxset\u0027s](https://haxset.com) Security Scanner and validated by their team.",
  "id": "GHSA-cqmq-8755-7xvh",
  "modified": "2026-08-21T20:55:11Z",
  "published": "2026-08-21T20:55:11Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/keystonejs/keystone/security/advisories/GHSA-cqmq-8755-7xvh"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keystonejs/keystone/pull/9859"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keystonejs/keystone/commit/9fb88b246950ce4de754a43fe6416f20403577b1"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/keystonejs/keystone"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keystonejs/keystone/releases/tag/@keystone-6/core@6.5.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Keystone vulnerable to `graphql.maxTake` bypass with negative `take`"
}

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.

Action not permitted

CVE-2026-63421 (GCVE-0-2026-63421)

FKIE_CVE-2026-63421

GHSA-CQMQ-8755-7XVH

Summary

Impact

Patches

Credit

Tags

Sightings

Nomenclature