Vulnerability-Lookup

CVE-2026-69197 (GCVE-0-2026-69197)

Vulnerability from cvelistv5 – Published: 2026-09-17 15:44 – Updated: 2026-09-17 17:23

Title

Umbraco: Delivery API leaks protected (Public Access) content through Content Picker / Multi-Node Tree Picker expansion

Summary

Umbraco is an ASP.NET CMS. Prior to 13.15.1, 17.5.3, and 18.0.2, the Content Delivery API applies member and Public Access checks to the directly requested node but not to referenced nodes serialized through Content Picker or Multi-Node Tree Picker properties, including pickers nested in Block List, Block Grid, or Rich Text Editor blocks. When DeliveryApi:PublicAccess is enabled, an anonymous caller can retrieve a protected node's name, route, and id through an unprotected referencing node and use ?expand to retrieve full property values. When the Delivery API is instead gated by the organization-wide API key, a key holder can still bypass per-node Public Access through the same expansion path. The same RequestContextOutputExpansionStrategyV2 and ElementOnlyOutputExpansionStrategy path also bypasses allowed or disallowed content-type alias restrictions for referenced content. Direct requests for the protected node still return 401, and no integrity or availability impact is established. This issue is fixed in versions 13.15.1, 17.5.3, and 18.0.2.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-17 17:23 UTC

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
CWE-862 - Missing Authorization

Assigner

GitHub_M mitre root

References

7 references

URL	Tags
https://github.com/umbraco/Umbraco-CMS/security/a…	x_refsource_CONFIRM
https://github.com/umbraco/Umbraco-CMS/commit/263…	x_refsource_MISC
https://github.com/umbraco/Umbraco-CMS/commit/536…	x_refsource_MISC
https://github.com/umbraco/Umbraco-CMS/commit/a96…	x_refsource_MISC
https://github.com/umbraco/Umbraco-CMS/releases/t…	x_refsource_MISC
https://github.com/umbraco/Umbraco-CMS/releases/t…	x_refsource_MISC
https://github.com/umbraco/Umbraco-CMS/releases/t…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
umbraco	Umbraco-CMS	Affected: >= 12.0.0, < 13.15.1 Affected: >= 14.0.0-rc1, < 17.5.3 Affected: >= 18.0.0, < 18.0.2	guessed

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-69197",
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        }
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        "discovery": "UNKNOWN"
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FKIE_CVE-2026-69197

Vulnerability from fkie_nvd - Published: 2026-09-17 16:17 - Updated: 2026-09-17 18:17

Severity

8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/umbraco/Umbraco-CMS/commit/26312a3f717a0f33bb3d7d28b14bef3592bdb0fe
	security-advisories@github.com	https://github.com/umbraco/Umbraco-CMS/commit/5360e2a9681ce2d0024be374e80339260bcc2511
	security-advisories@github.com	https://github.com/umbraco/Umbraco-CMS/commit/a9649da4e5a0786db7688bd6b5036a21df26b015
	security-advisories@github.com	https://github.com/umbraco/Umbraco-CMS/releases/tag/release-13.15.1
	security-advisories@github.com	https://github.com/umbraco/Umbraco-CMS/releases/tag/release-17.5.3
	security-advisories@github.com	https://github.com/umbraco/Umbraco-CMS/releases/tag/release-18.0.2
	security-advisories@github.com	https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-wr57-hqmp-fgvh

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Umbraco-CMS",
          "vendor": "umbraco",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 12.0.0, \u003c 13.15.1"
            },
            {
              "status": "affected",
              "version": "\u003e= 14.0.0-rc1, \u003c 17.5.3"
            },
            {
              "status": "affected",
              "version": "\u003e= 18.0.0, \u003c 18.0.2"
            }
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        }
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    }
  ],
  "id": "CVE-2026-69197",
  "lastModified": "2026-09-17T18:17:05.090",
  "metrics": {
    "cvssMetricV40": [
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          "Recovery": "NOT_DEFINED",
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          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.7,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
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          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-69197",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-17T17:23:00.299716Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-17T16:17:41.010",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/umbraco/Umbraco-CMS/commit/26312a3f717a0f33bb3d7d28b14bef3592bdb0fe"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/umbraco/Umbraco-CMS/commit/5360e2a9681ce2d0024be374e80339260bcc2511"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/umbraco/Umbraco-CMS/commit/a9649da4e5a0786db7688bd6b5036a21df26b015"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/umbraco/Umbraco-CMS/releases/tag/release-13.15.1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/umbraco/Umbraco-CMS/releases/tag/release-17.5.3"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/umbraco/Umbraco-CMS/releases/tag/release-18.0.2"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-wr57-hqmp-fgvh"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-200"
        },
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-WR57-HQMP-FGVH

Vulnerability from github – Published: 2026-09-17 16:29 – Updated: 2026-09-17 16:29

Summary

Umbraco: Delivery API leaks protected (Public Access) content through Content Picker / Multi-Node Tree Picker expansion

Details

The Content Delivery API enforces member / Public Access protection only at the controller layer, against the node that is directly requested. When a public (unprotected) node references a protected node through a Content Picker or Multi-Node Tree Picker (including those nested inside Block List, Block Grid, or Rich Text Editor blocks), the Delivery API expands and serializes the protected node with no access check applied.

Similarly, configuration based restrictions based on aliases of allowed or disallowed content types are by-passed for referenced content items that are retrieved via property expansion.

As a result, an anonymous / unauthorized caller can retrieve a protected node's: - Name, route, and id — always, even without expansion, and - Full property values — when the request uses ?expand on the picker property. A direct request for the same protected node correctly returns 401 Unauthorized, which makes the leak easy to miss: the protection appears to work, but is bypassed via reference expansion.

Impact

Confidential, member-gated content (e.g. pricing, internal documents, gated articles) referenced by any publicly readable node is disclosed to unauthenticated clients. No write/integrity or availability impact.

Highest impact when the Delivery API is publicly readable (DeliveryApi:PublicAccess: true). Still exploitable, at reduced severity, when the Delivery API is gated by the org-wide API key (the key holder still bypasses per-node Public Access).

Patches

13.15.1, 17.5.3, 18.0.2

References

https://docs.umbraco.com/umbraco-cms/develop-with-umbraco/headless-and-apis/content-delivery-api

Severity

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "Umbraco.Cms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "12.0.0"
            },
            {
              "fixed": "13.15.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "Umbraco.Cms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "14.0.0-rc1"
            },
            {
              "fixed": "17.5.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "Umbraco.Cms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "18.0.0"
            },
            {
              "fixed": "18.0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-69197"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200",
      "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-17T16:29:46Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "The Content Delivery API enforces member / Public Access protection only at the controller layer, against the node that is directly requested. When a public (unprotected) node references a protected node through a Content Picker or Multi-Node Tree Picker (including those nested inside Block List, Block Grid, or Rich Text Editor blocks), the Delivery API expands and serializes the protected node with no access check applied.\n\nSimilarly, configuration based restrictions based on aliases of allowed or disallowed content types are by-passed for referenced content items that are retrieved via property expansion.\n\nAs a result, an anonymous / unauthorized caller can retrieve a protected node\u0027s:\n- Name, route, and id \u2014 always, even without expansion, and\n- Full property values \u2014 when the request uses ?expand on the picker property.\nA direct request for the same protected node correctly returns 401 Unauthorized, which makes the leak easy to miss: the protection appears to work, but is bypassed via reference expansion.\n\n### Impact\nConfidential, member-gated content (e.g. pricing, internal documents, gated articles) referenced by any publicly readable node is disclosed to unauthenticated clients. No write/integrity or availability impact.\n\nHighest impact when the Delivery API is publicly readable (DeliveryApi:PublicAccess: true).\nStill exploitable, at reduced severity, when the Delivery API is gated by the org-wide API key (the key holder still bypasses per-node Public Access).\n\n### Patches\n13.15.1, 17.5.3, 18.0.2\n\n### References\nhttps://docs.umbraco.com/umbraco-cms/develop-with-umbraco/headless-and-apis/content-delivery-api",
  "id": "GHSA-wr57-hqmp-fgvh",
  "modified": "2026-09-17T16:29:46Z",
  "published": "2026-09-17T16:29:46Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-wr57-hqmp-fgvh"
    },
    {
      "type": "WEB",
      "url": "https://github.com/umbraco/Umbraco-CMS/commit/26312a3f717a0f33bb3d7d28b14bef3592bdb0fe"
    },
    {
      "type": "WEB",
      "url": "https://github.com/umbraco/Umbraco-CMS/commit/5360e2a9681ce2d0024be374e80339260bcc2511"
    },
    {
      "type": "WEB",
      "url": "https://github.com/umbraco/Umbraco-CMS/commit/a9649da4e5a0786db7688bd6b5036a21df26b015"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/umbraco/Umbraco-CMS"
    },
    {
      "type": "WEB",
      "url": "https://github.com/umbraco/Umbraco-CMS/releases/tag/release-13.15.1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/umbraco/Umbraco-CMS/releases/tag/release-17.5.3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/umbraco/Umbraco-CMS/releases/tag/release-18.0.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Umbraco: Delivery API leaks protected (Public Access) content through Content Picker / Multi-Node Tree Picker expansion"
}

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.

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Action not permitted

CVE-2026-69197 (GCVE-0-2026-69197)

FKIE_CVE-2026-69197

GHSA-WR57-HQMP-FGVH

Impact

Patches

References

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