NIST deprecates RSA-2048 from 2030. Find every one of them before attackers do.
.NET
.NET NuGet
Not in CISA KEV
MEDIUM severity

CVE-2024-43377 — Umbraco.Cms

MEDIUMFix: umbraco/Umbraco-CMS@72bef88

CVE-2024-43377 is a medium-severity (CVSS 5.4) CWE-284 vulnerability in Umbraco.Cms. A fix is available for Umbraco.Cms — see the affected versions and patch details below.

Umbraco CMS Improper Access Control vulnerability

Also known asGHSA-hrww-x3fq-xcvh
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2024-43377.

EPSS Exploitation Probability

via FIRST.org ↗
0.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs16th percentile — riskier than 16% of all scored CVEsHighest risk
0.00%0.30%0.61%0.92%0.4%0.2%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
.NETUmbraco.Cms

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.

Description

Impact

As an authenticated user one can access a few unintended endpoints

Explanation of the vulnerability

Few endpoints in Umbraco Management API was not protected by a specific section. These just required you to be authenticated. Due to the fact that a member is also just authenticated, it was possible to get info from these endpoints using a member token.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
.NETNuGetUmbraco.Cms≥ 14.0.0&&< 14.1.214.1.2dotnet add package Umbraco.Cms --version 14.1.2

Affected Products

1 product · 1 configurations
Application
umbraco cmsumbraco
≥ 14.0.0 && < 14.1.2
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for Umbraco.Cms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update Umbraco.Cms to 14.1.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-43377 is resolved across your whole dependency graph.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

### Impact As an authenticated user one can access a few unintended endpoints ### Explanation of the vulnerability Few endpoints in Umbraco Management API was not protected by a specific section. These just required you to be authenticated. Due to the fact that a member is also just authenticated, it was possible to get info from these endpoints using a member token.
O3 Security · Impact-Aware SCA

Is CVE-2024-43377 in your dependencies?

Find it across NuGet, including transitive dependencies.

Scan my dependencies How O3 SCA works
CVE-2024-43377: Umbraco.Cms — Fixed in 14.1.2