CVE-2025-46736: umbraco cms — Fix

Description

Umbraco is a free and open source .NET content management system. Prior to versions 10.8.10 and 13.8.1, based on an analysis of the timing of post login API responses, it's possible to determine whether an account exists. The issue is patched in versions 10.8.10 and 13.8.1. No known workarounds are available.

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CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Weakness Type (CWE)

CWE-204 CWE-204

Affected Products

Vendor	Product	Versions
umbraco	umbraco_cms	< 10.8.10
umbraco	umbraco_cms	10.9.0 — 13.8.1

References

Advisories & Patches

https://github.com/umbraco/Umbraco-CMS/commit/14fbd20665b453cbf094ccf4575b79a9fba07e03 https://github.com/umbraco/Umbraco-CMS/commit/34709be6cce9752dfa767dffbf551305f48839bc https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-4g8m-5mj5-c8xg

Frequently Asked Questions

What is CVE-2025-46736? +

Umbraco is a free and open source .NET content management system. Prior to versions 10.8.10 and 13.8.1, based on an analysis of the timing of post login API responses, it's possible to determine whether an account exists. The issue is patched in versions 10.8.10 and 13.8.1. No known workarounds are available. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2025-46736? +

CVE-2025-46736 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-46736? +

CVE-2025-46736 affects products from umbraco, specifically: umbraco_cms. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-46736? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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