CVE-2024-28868: Umbraco possible user enumeration vulnerability

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-03-20 · updated 2026-06-17
Weakness: CWE-204

Description

Umbraco is an ASP.NET content management system. Umbraco 10 prior to 10.8.4 with access to the native login screen is vulnerable to a possible user enumeration attack. This issue was fixed in version 10.8.5. As a workaround, one may disable the native login screen by exclusively using external logins.

Affected products

Umbraco-CMS: from 10.0.0 before 10.8.5 — fixed in 10.8.5

How to fix

Upgrade to a fixed version: Umbraco-CMS 10.8.5. Check the vendor advisory for mitigations.

References

https://github.com/umbraco/Umbraco-CMS/commit/7e1d1a1968000226cd882fff078b122b8d46c44d
https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-552f-97wf-pmpq
https://github.com/umbraco/Umbraco-CMS/commit/7e1d1a1968000226cd882fff078b122b8d46c44d
https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-552f-97wf-pmpq

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