Vulnerability · Published May 6, 2025 · Assigned by GitHub_M

CVE-2025-46736Umbraco Makes User Enumeration Feasible Based on Timing of Login Response

Medium 5.3

In plain English

A medium-severity security flaw in Umbraco-CMS from umbraco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.4%top 66.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
NuGet	umbraco.cms	13.8.1	GHSA-4g8m-5mj5-c8xg
NuGet	umbraco.cms	10.8.10	GHSA-4g8m-5mj5-c8xg

Affected products (as reported)

Vendor	Product	Versions
umbraco	Umbraco-CMS	>= 11.0.0-rc1, < 13.8.1< 10.8.10

Weakness: CWE-204 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References

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