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PUBLISHED

2026-09-17 16:17

MODIFIED

2026-09-17 16:17

CVSS_SCORE V3

8.7

EPSS (Prob. Exploit)

0.66%

Top 49.3%

DATA SOURCES:

NVD 🔗 2026-09-17 CWE MITRE 🔗 2026-10-01 FIRST EPSS 🔗 2026-10-18 GITHUB 🔗 2026-10-15 OSV 🔗 2026-10-19

> DESCRIPTION

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.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR

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

> MÉTRIQUES CVSS DÉTAILLÉES

                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
            

Métrique	Valeur	Interprétation
AV (Vecteur d'Attaque) Attack Vector	Network (N)	Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque) Attack Complexity	Low (L)	Peu de conditions requises pour exploiter
PR (Privilèges Requis) Privileges Required	None (N)	Aucune authentification requise
UI (Interaction Utilisateur) User Interaction	None (N)	Aucune interaction utilisateur nécessaire
S (Périmètre) Scope	Unchanged (U)	Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité) Confidentiality Impact	High (H)	Divulgation totale d'informations
I (Impact Intégrité) Integrity Impact	None (N)	Aucune modification de données possible
A (Impact Disponibilité) Availability Impact	None (N)	Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité

High

Divulgation totale d'informations

Intégrité

None

Aucune modification de données possible

Disponibilité

None

Aucune interruption de service

> WEAKNESSES

CWE-200 CWE-862

> CWE DETAILED DESCRIPTIONS

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor - The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. | CWE-862: Missing Authorization - The product does not perform an authorization check when an actor attempts to access a resource or perform an action.