Affected: open-webui

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6, the SafePlaywrightURLLoader implements a validate_url function to prevent SSRF attacks by checking the IP address of the user-provided URL. However, this validation is performed only on the initial URL. Since Playwright automatically follows HTTP redirects (301/302) by default, an attacker can bypass the validation by providing a safe URL that redirects to a restricted internal network address (e.g., localhost, Docker container network, or Cloud Metadata). This allows the application to access internal services despite ENABLE_RAG_LOCAL_WEB_FETCH being set to False This vulnerability is fixed in 0.9.6.

Affected: PyPI: open-webui

### Summary The SafePlaywrightURLLoader implements a validate_url function to prevent SSRF attacks by checking the IP address of the user-provided URL. However, this validation is performed only on the initial URL.

Since Playwright automatically follows HTTP redirects (301/302) by default, an attacker can bypass the validation by providing a safe URL that redirects to a restricted internal network address (e.g., localhost, Docker container network, or Cloud Metadata).

This allows the application to access internal services despite ENABLE_RAG_LOCAL_WEB_FETCH being set to False

### Details Root Cause

The application validates the initial user-provided URL using self._safe_process_url_sync(url). This correctly resolves the domain and ensures it does not point to a private IP.

The application then calls page.goto(url). By default, Playwright automatically follows HTTP redirects (301/302).

The Bypass: If the destination server returns a redirect to an internal IP (e.g., 127.0.0.1 or 169.254.169.254), the browser follows it without re-validating the new destination. The initial validation is bypassed because it only checked the first URL, not the entire redirect chain.

```python for url in self.urls: try: self._safe_process_url_sync(url) page = browser.new_page() response = page.goto(url, timeout=self.playwright_timeout) #this if response is None: raise ValueError(...) text = self.evaluator.evaluate(page, browser, r…