GHSA-2m4f-cg75-76w2 — medium GitHub Advisory (CVE-2025-66470) in pip/nicegui

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:

&lt;g v-html=&quot;content&quot;&gt;&lt;/g&gt;

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(&#x27;/&#x27;)
def main():
    ui.label(&#x27;NiceGUI SVG XSS PoC&#x27;)

    # Standard image loading
    img = ui.interactive_image(&#x27;[https://picsum.photos/640/360](https://picsum.photos/640/360)&#x27;)

    # Payload: Embeds raw HTML execution inside SVG
    # This executes immediately when the image component is rendered
    img.content = (
        &#x27;&lt;foreignObject&gt;&#x27;
        &#x27;&lt;body xmlns=&quot;[http://www.w3.org/1999/xhtml](http://www.w3.org/1999/xhtml)&quot;&gt;&#x27;
        &#x27;&lt;img src=x onerror=alert(&quot;XSS-SVG&quot;)&gt;&#x27;
        &#x27;&lt;/body&gt;&#x27;
        &#x27;&lt;/foreignObject&gt;&#x27;
    )

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.

Basic information

Type: reviewed
Severity: medium
Advisory on GitHub: Open advisory ↗
Repository advisory: Open repository advisory ↗
Source code: Browse source ↗
Published (advisory): 2025-12-08 21:30:39 UTC
Updated: 2025-12-09 16:32:10 UTC
GitHub reviewed: 2025-12-08 21:30:39 UTC
NVD published: 2025-12-09 01:16:54 UTC

Score	Percentile
0.02%	5.44%

CVSS Scores

Base score	Version	Severity	Vector
6.1	3.1	—	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:N) Service keeps running; no real outage angle.

Identifiers

Type	Value
GHSA	GHSA-2m4f-cg75-76w2 ↗
CVE	CVE-2025-66470 ↗

CWEs

CWE id	Name
CWE-79	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Credits

twmoon (reporter)
evnchn (remediation_developer)
falkoschindler (remediation_reviewer)

Affected packages (1)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem	Package	Vulnerable range	First patched	Vulnerable functions
pip	nicegui	<= 3.3.1	3.4.0	—

NiceGUI Stored/Reflected XSS in ui.interactive_image via unsanitized SVG content