https://cve.radiocsirt.org Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Tue, 06 Oct 2026 20:32:43 +0000 https://cve.radiocsirt.org/vuln/cve-2026-21872 <p><strong>Affected:</strong> zauberzeug nicegui</p> <p>NiceGUI is a Python-based UI framework. From versions 2.22.0 to 3.4.1, an unsafe implementation in the click event listener used by ui.sub_pages, combined with attacker-controlled link rendering on the page, causes XSS when the user actively clicks on the link. This issue has been patched in version 3.5.0.</p> <p><strong>Affected:</strong> zauberzeug nicegui</p> <p>NiceGUI is a Python-based UI framework. From versions 2.22.0 to 3.4.1, an unsafe implementation in the click event listener used by ui.sub_pages, combined with attacker-controlled link rendering on the page, causes XSS when the user actively clicks on the link. This issue has been patched in version 3.5.0.</p> https://cve.radiocsirt.org/vuln/cve-2026-21872 https://cve.radiocsirt.org/vuln/ghsa-m7j5-rq9j-6jj9 <p><strong>Affected:</strong> PyPI: nicegui</p> <p>### Summary</p> <p>An unsafe implementation in the `click` event listener used by `ui.sub_pages`, combined with attacker-controlled link rendering on the page, causes an XSS when the user actively clicks on the link.</p> <p>### Details</p> <p>1. On `click`, eventually `sub_pages_navigate` event is emitted. https://github.com/zauberzeug/nicegui/blob/59fa9424c470f1b12c5d368985fa36e21fda706b/nicegui/elements/sub_pages.js#L41-L63</p> <p>2. SubPagesRouter (used by ui.sub_pages), lisnening on `sub_pages_navigate`, `_handle_navigate` runs. https://github.com/zauberzeug/nicegui/blob/59fa9424c470f1b12c5d368985fa36e21fda706b/nicegui/sub_pages_router.py#L18-L22</p> <p>3. `_handle_navigate` runs `run_javascript` with f-string substituting `self.current_path` which is simply surrounded by double-quotes. The string context can be broken out easily.</p> <p>https://github.com/zauberzeug/nicegui/blob/59fa9424c470f1b12c5d368985fa36e21fda706b/nicegui/sub_pages_router.py#L73-L88</p> <p>### PoC</p> <p>The minimal PoC boils down to this:</p> <p>```py from nicegui import ui</p> <p>ui.sub_pages({&#39;/&#39;: lambda: ui.link(&#39;Go to XSS&#39;, &#39;/&#34;+alert(1)+&#34;&#39;)})</p> <p>ui.run() ```</p> <p>However, it is more likely that the attack takes place with attacker-controlled input, for which this shows it:</p> <p>```py from nicegui import app, ui</p> <p>ui.sub_pages({&#39;/&#39;: lambda: ui.label(&#39;Hello, World!&#39;)})</p> <p>ui.textarea(&#39;Markdown content&#39;).bind_value(app.storage.general, &#39;markdown_content&#39;)</p> <p>ui.markdown().bind_content_from(app.storage.general, &#39;markdown_content&#39;)</p> <p>ui.run() ```</p> <p>Vulnerable input is `[X…</p> <p><strong>Affected:</strong> PyPI: nicegui</p> <p>### Summary</p> <p>An unsafe implementation in the `click` event listener used by `ui.sub_pages`, combined with attacker-controlled link rendering on the page, causes an XSS when the user actively clicks on the link.</p> <p>### Details</p> <p>1. On `click`, eventually `sub_pages_navigate` event is emitted. https://github.com/zauberzeug/nicegui/blob/59fa9424c470f1b12c5d368985fa36e21fda706b/nicegui/elements/sub_pages.js#L41-L63</p> <p>2. SubPagesRouter (used by ui.sub_pages), lisnening on `sub_pages_navigate`, `_handle_navigate` runs. https://github.com/zauberzeug/nicegui/blob/59fa9424c470f1b12c5d368985fa36e21fda706b/nicegui/sub_pages_router.py#L18-L22</p> <p>3. `_handle_navigate` runs `run_javascript` with f-string substituting `self.current_path` which is simply surrounded by double-quotes. The string context can be broken out easily.</p> <p>https://github.com/zauberzeug/nicegui/blob/59fa9424c470f1b12c5d368985fa36e21fda706b/nicegui/sub_pages_router.py#L73-L88</p> <p>### PoC</p> <p>The minimal PoC boils down to this:</p> <p>```py from nicegui import ui</p> <p>ui.sub_pages({&#39;/&#39;: lambda: ui.link(&#39;Go to XSS&#39;, &#39;/&#34;+alert(1)+&#34;&#39;)})</p> <p>ui.run() ```</p> <p>However, it is more likely that the attack takes place with attacker-controlled input, for which this shows it:</p> <p>```py from nicegui import app, ui</p> <p>ui.sub_pages({&#39;/&#39;: lambda: ui.label(&#39;Hello, World!&#39;)})</p> <p>ui.textarea(&#39;Markdown content&#39;).bind_value(app.storage.general, &#39;markdown_content&#39;)</p> <p>ui.markdown().bind_content_from(app.storage.general, &#39;markdown_content&#39;)</p> <p>ui.run() ```</p> <p>Vulnerable input is `[X…</p> https://cve.radiocsirt.org/vuln/ghsa-m7j5-rq9j-6jj9