> 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/xss/xss-with-blocked-events-and-href-attributes.md).

# XSS avec événements bloqués et attributs href

Notes sur le XSS avec événements bloqués et attributs href pour les laboratoires PortSwigger Web Security Academy, y compris le flux de travail d’exploitation, les tests de charge utile, la validation avec Burp Suite et le contexte de remédiation.

### XSS réfléchi avec gestionnaires d'événements et attributs href bloqué

Lab d L'opération doit injecter un élément cliquable avec les mots **"Clique"** (ou équivalent) et déclencher `alert()` au clic.

Insérez un élément visible portant le mot **Cliquez sur** qui, lorsque l'utilisateur clique dessus, exécute `alert()` malgré l'interdiction des gestionnaires d'événements et `href`.

```javascript
<script>
```

* En insérant `<script>` renvoie : *Balise non autorisée*.

<figure><img src="https://3840167291-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-1316ca1ba67d36888ded2cf56c151a1b2fa1f21e%2Fimage%20(404).png?alt=media" alt=""><figcaption></figcaption></figure>

* Le `<a>` la balise est acceptée (par exemple `<a>test</a>`),

```javascript
<a>test</a>
```

<figure><img src="https://3840167291-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-91e0aa4a451fd6594f5d219cb35a39e0ecdc711f%2Fimage%20(405).png?alt=media" alt="" width="510"><figcaption></figcaption></figure>

Le `href` l'attribut est refusé — `href="JavaScript:..."` est bloqué.

```javascript
<a href="javascript:alert(0);"Cliquez-moi</a>
```

<figure><img src="https://3840167291-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-dfe2ceb6f9051dee18a984c1a6331a902a6e97fc%2Fimage%20(406).png?alt=media" alt=""><figcaption></figcaption></figure>

* Les éléments SVG sont autorisés (`<svg>` est accepté).

```javascript
<svg>
```

<figure><img src="https://3840167291-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-5ee9d764293ec3cbc9f953fefb54a7a2d0bbac1a%2Fimage%20(407).png?alt=media" alt="" width="563"><figcaption></figcaption></figure>

* Les éléments d'animation SVG (tels que `<animate>`) semblent présents et exploitables.

<figure><img src="https://3840167291-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-67d7ecc4ff55d20ab9571418bdeae2e164123c29%2Fimage%20(408).png?alt=media" alt=""><figcaption></figcaption></figure>

**Tentatives —**

* Injecter `<script>` → rejeté.
* Utilisez `<a href="JavaScript:...">` → attribut interdit.
* Contourner le blocage en combinant des éléments SVG et d'animation pour transférer une `href` valeur vers un ancrage et ainsi tenter d'exécuter `JavaScript:alert(0)` au clic.

```javascript
<svg><a><animate attributeName=href values=javascript:alert(0) /><text x=30 y=30>Cliquez-moi !</script></a>
```


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