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

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

6.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS

• CVE-2025-66470: 0.25% estimated exploitation activity in the next 30 days; percentile 17.03 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary A Cross-Site Scripting (XSS) vulnerability exists in the ui.interactiveimage 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/interactiveimage.js. The component uses the following code to render content: 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 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…

Published by the source

8 Dec 2025, 21:30 UTC

Last modified by the source

7 Jul 2026, 17:56 UTC

Source last checked

26 Oct 2026, 13:36 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-2m4f-cg75-76w2

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-2m4f-cg75-76w2

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# Patch Next advisory brief: CVE-2025-66470

Advisory: NiceGUI Stored/Reflected XSS in ui.interactive_image via unsanitized SVG content
IDs: CVE-2025-66470, GHSA-2m4f-cg75-76w2
Record: https://patchnext.com/advisories/cve-2025-66470 (revision 2, source checked 26 Oct 2026, 13:36 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: nicegui 3.4.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI nicegui: affected <= 3.3.1; fixed in 3.4.0

## Suggested inspection (read-only)
- `python -m pip show nicegui`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on nicegui.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-2m4f-cg75-76w2 (OSV record GHSA-2m4f-cg75-76w2 lists affected ranges: PyPI nicegui >=0 <3.4.0 (fixed))
- Verified: https://github.com/advisories/GHSA-2m4f-cg75-76w2 (GitHub-reviewed advisory GHSA-2m4f-cg75-76w2 lists affected ranges: PyPI nicegui >=0 <=3.3.1)

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