CVE-2025-46736

Umbraco Makes User Enumeration Feasible Based on Timing of Login Response

5.3 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: None
Availability: None

Exploit likelihood

0.39%Up 0.4 points since May 7, 2025

What each source reports

CVE List Score used 5.3

Umbraco Makes User Enumeration Feasible Based on Timing of Login Response

Record: CVE-2025-46736
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness: CWE-204
Updated: 2026-11-02

EUVDEUVD-2025-13623 5.3

Record: EUVD-2025-13623
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-4g8m-5mj5-c8xg 5.3

Umbraco Makes User Enumeration Feasible Based on Timing of Login Response

Impact

Based on an analysis of the timing of post login API responses, it's possible to determine whether an account exists.

Patches

Patched in 10.8.10 and 13.8.1.

Workarounds

None available.

Record: GHSA-4g8m-5mj5-c8xg
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness: CWE-204
Updated: 2026-11-02

NVD 5.3

Record: CVE-2025-46736
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness: CWE-204
Updated: 2026-11-02

OSV 5.3

Umbraco Makes User Enumeration Feasible Based on Timing of Login Response

Record: CVE-2025-46736
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness: CWE-204
Updated: 2026-11-02

OSVGHSA-4g8m-5mj5-c8xg 5.3

Umbraco Makes User Enumeration Feasible Based on Timing of Login Response

Impact

Based on an analysis of the timing of post login API responses, it's possible to determine whether an account exists.

Patches

Patched in 10.8.10 and 13.8.1.

Workarounds

None available.

Record: GHSA-4g8m-5mj5-c8xg
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness: CWE-204
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`Umbraco.Cms` NuGet	11.0.0-rc1 up to 13.8.1	13.8.1
`Umbraco.Cms` NuGet	before 10.8.10	10.8.10
`Umbraco.Cms` NuGet	11.0.0-rc1 up to 13.8.1, plus listed versions 11.0.011.0.0-rc211.0.0-rc311.0.0-rc411.0.0-rc5 Show 45 moreShow less 11.0.0-rc611.1.011.1.0-rc11.2.011.2.0-rc11.2.111.2.211.3.011.3.0-rc11.3.111.4.011.4.0-rc11.4.111.4.211.5.011.5.0-rc12.0.012.0.0-rc112.0.0-rc212.0.0-rc312.0.0-rc412.0.0-rc512.0.112.1.012.1.0-rc12.1.112.1.212.2.012.2.0-rc12.3.012.3.0-rc12.3.112.3.1012.3.212.3.312.3.412.3.512.3.612.3.712.3.812.3.913.0.013.0.0-rc113.0.0-rc213.0.0-rc3	13.8.1
`Umbraco.Cms` NuGet	before 10.8.10, plus listed versions 10.0.010.0.0-rc110.0.0-rc210.0.0-rc310.0.0-rc4 Show 45 moreShow less 10.0.0-rc510.0.110.1.010.1.0-rc10.1.0-rc210.1.110.2.010.2.0-rc10.2.110.3.010.3.0-rc10.3.110.3.210.4.010.4.0-rc10.4.110.4.210.5.010.5.0-rc10.5.110.6.010.6.0-rc10.6.110.7.010.7.0-rc10.8.010.8.0-rc10.8.110.8.210.8.310.8.410.8.510.8.610.8.710.8.810.8.99.0.09.0.0-rc0019.0.0-rc0029.0.0-rc0039.0.0-rc0049.0.19.1.09.1.0-rc9.1.1	10.8.10

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-46736 is a medium vulnerability (CVSS 5.3) in Umbraco Umbraco-cms, published May 6, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.39%, the 33rd percentile. Fixed in Umbraco.Cms 13.8.1.

References

This page doesn't list everything

Left out here: 53 versions. The JSON record has them.