What’s Vulnerable › Vulnerabilities

CVE-2025-24011: Umbraco CMS Vulnerable to User Enumeration Feasible Based On Management API Timing and Response Codes

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-01-21 · updated 2026-06-17
• Weakness: CWE-200

Description

Umbraco is a free and open source .NET content management system. Starting in version 14.0.0 and prior to versions 14.3.2 and 15.1.2, it's possible to determine whether an account exists based on an analysis of response codes and timing of Umbraco management API responses. Versions 14.3.2 and 15.1.2 contain a patch. No known workarounds are available.

Affected products

• Umbraco-CMS: from 14.0.0 before 14.3.2; from 15.0.0 before 15.1.2 — fixed in 14.3.2, 15.1.2

How to fix

Upgrade to a fixed version: Umbraco-CMS 14.3.2, 15.1.2. Check the vendor advisory for mitigations.

References

• https://github.com/umbraco/Umbraco-CMS/commit/559c6c9f312df1d6eb1bde82c4b81c0896da6382
• https://github.com/umbraco/Umbraco-CMS/commit/839b6816f2ae3e5f54459a0f09dad6b17e2d1e07
• https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-hmg4-wwm5-p999

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