CVE-2020-29454

Incorrect permission enforcement in UmbracoCms

4.3 MediumFix available

Editors/LogViewerController.cs in Umbraco through 8.9.1 allows a user to visit a logviewer endpoint even if they lack Applications.Settings access.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: None
Availability: None

Exploit likelihood

0.91%Up 0.5 points since Apr 14, 2021

What each source reports

NVD Score used 4.3

Editors/LogViewerController.cs in Umbraco through 8.9.1 allows a user to visit a logviewer endpoint even if they lack Applications.Settings access.

Record: CVE-2020-29454
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CVSS 2.0: 4.0 MediumAV:N/AC:L/Au:S/C:P/I:N/A:N
Weakness: CWE-863
Updated: 2026-11-02

CVE List No score

Editors/LogViewerController.cs in Umbraco through 8.9.1 allows a user to visit a logviewer endpoint even if they lack Applications.Settings access.

Record: CVE-2020-29454
Updated: 2026-11-02

EUVDEUVD-2021-0761 No score

Editors/LogViewerController.cs in Umbraco through 8.9.1 allows a user to visit a logviewer endpoint even if they lack Applications.Settings access.

Record: EUVD-2021-0761
Updated: 2026-11-03

GitHub AdvisoriesGHSA-4vp3-vfww-8648 4.3

Incorrect permission enforcement in UmbracoCms

Editors/LogViewerController.cs in Umbraco through 8.9.1 allows a user to visit a logviewer endpoint even if they lack Applications.Settings access.

Record: GHSA-4vp3-vfww-8648
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness: CWE-732
Updated: 2026-11-02

OSV 4.3

Editors/LogViewerController.cs in Umbraco through 8.9.1 allows a user to visit a logviewer endpoint even if they lack Applications.Settings access.

Record: CVE-2020-29454
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Updated: 2026-11-02

OSVGHSA-4vp3-vfww-8648 4.3

Incorrect permission enforcement in UmbracoCms

Editors/LogViewerController.cs in Umbraco through 8.9.1 allows a user to visit a logviewer endpoint even if they lack Applications.Settings access.

Record: GHSA-4vp3-vfww-8648
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness: CWE-732
Updated: 2026-11-02

Affected products

umbraco cms

Affected packages

Affected packages
Package	Affected	Fixed
`UmbracoCms` NuGet	before 8.10.0	8.10.0
`UmbracoCms` NuGet	before 8.10.0, plus listed versions 4.10.04.10.0-beta4.10.0-rc4.10.14.10.1.1 Show 45 moreShow less 4.11.04.11.14.11.104.11.24.11.2.14.11.2.24.11.2.34.11.34.11.3.14.11.44.11.54.11.64.11.74.11.84.11.94.7.24.8.04.8.0-beta4.8.14.9.04.9.16.0.06.0.0-RC6.0.0-beta6.0.16.0.26.0.36.0.46.0.56.0.66.0.76.0.7.16.1.06.1.0-beta6.1.0-beta-26.1.16.1.26.1.2.16.1.2.26.1.36.1.46.1.56.1.66.2.06.2.0-RC	8.10.0

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-29454 is a medium vulnerability (CVSS 4.3) in Umbraco Cms, published December 2, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.91%, the 60th percentile. Fixed in UmbracoCms 8.10.0.

References

This page doesn't list everything

Left out here: 218 versions. The JSON record has them.