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PYSEC-2026-1696

MediumCVSS 6.1 / 10
Published Jul 7, 2026·Last modified Jul 7, 2026
Affected Components(1)
PyPI logonicegui
< 3.4.0
Description

Summary

A Cross-Site Scripting (XSS) vulnerability exists in the ui.interactive_image component of NiceGUI (v3.3.1 and earlier). The component renders SVG content using Vue's v-html directive without any sanitization. This allows attackers to inject malicious HTML or JavaScript via the SVG <foreignObject> tag.

Details

The vulnerability is located in nicegui/elements/interactive_image.js. The component uses the following code to render content:

<g v-html="content"></g>

Vue's v-html directive renders raw HTML strings into the DOM. If an application allows user-controlled input to be passed to the content property of an interactive image, an attacker can embed a <foreignObject> tag containing malicious scripts, bypassing typical image restrictions.

PoC

from nicegui import ui

@ui.page('/')
def main():
    ui.label('NiceGUI SVG XSS PoC')
    
    # Standard image loading
    img = ui.interactive_image('[https://picsum.photos/640/360](https://picsum.photos/640/360)')
    
    # Payload: Embeds raw HTML execution inside SVG
    # This executes immediately when the image component is rendered
    img.content = (
        '<foreignObject>'
        '<body xmlns="[http://www.w3.org/1999/xhtml](http://www.w3.org/1999/xhtml)">'
        '<img src=x onerror=alert("XSS-SVG")>'
        '</body>'
        '</foreignObject>'
    )

ui.run()

Impact

  • Type: Reflected / Stored XSS (depending on data source)

  • Severity: Moderate

  • Impact: Attackers can inject malicious scripts that execute whenever the image component is rendered or updated. This is particularly dangerous for dashboards or multi-user applications displaying user-generated content or annotations.

Risk Scores
Base Score
6.1

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. The attacker needs the user to perform some action, like clicking a link. The vulnerability can affect other systems as well, not just the initial system. There is a low impact on the confidentiality of the information. There is a low impact on the integrity of the data.

Threat Intelligence
5.6

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.22%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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