CVE-2020-29454 Incorrect permission enforcement in UmbracoCms
Attackers can access log viewer endpoints without proper authorization, potentially exposing sensitive application logs.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-29454?
CVE-2020-29454 is a medium-severity missing authorization vulnerability in Umbraco Umbraco Cms, published on 2 Dec 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Editors/LogViewerController.cs in Umbraco through 8.9.1 allows a user to visit a logviewer endpoint even if they lack Applications.Settings access.
Weakness: CWE-863
Which versions are affected by CVE-2020-29454?
2 open source packages ship an affected version, including UmbracoCms. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
UmbracoCms NuGet | All versions | 8.10.0 |
UmbracoCms NuGet | All versions | 8.10.0 |
Products include Umbraco Umbraco Cms.
How do I fix CVE-2020-29454?
Upgrade UmbracoCms to 8.10.0 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2020-29454 being exploited?
There is no known exploitation of CVE-2020-29454 in the wild and no public exploit code.
Other vulnerabilities in Umbraco Umbraco Cms
- CVE-2025-67288 Umbraco CMS has an arbitrary file upload vulnerability
- CVE-2014-10074 File upload in n/a
- CVE-2012-1301 Server-side request forgery in n/a
- CVE-2012-10054 Umbraco CMS < 4.7.1 codeEditorSave.asmx RCE
- CVE-2025-32017 Umbraco has a Management API Vulnerability to Path Traversal With Authenticated Users
Sources
Also known as GHSA-4vp3-vfww-8648.