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

> Attackers can enumerate valid user accounts by analyzing login response timing, exposing user existence information.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 6 May 2025
- **Updated:** 6 May 2025
- **Also known as:** GHSA-4g8m-5mj5-c8xg

## What is CVE-2025-46736?

CVE-2025-46736 is a medium-severity vulnerability in Umbraco Umbraco Cms, published on 6 May 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### 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.

Weakness: CWE-204 (Observable Response Discrepancy)

## Which versions are affected by CVE-2025-46736?

4 open source packages ship an affected version, including Umbraco.Cms. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `Umbraco.Cms` | NuGet | All versions | 10.8.10 |
| `Umbraco.Cms` | NuGet | All versions | 10.8.10 |
| `Umbraco.Cms` | NuGet | From 11.0.0-rc1 | 13.8.1 |
| `Umbraco.Cms` | NuGet | From 11.0.0-rc1 | 13.8.1 |

Products: Umbraco Umbraco Cms.

## How do I fix CVE-2025-46736?

Upgrade Umbraco.Cms to a fixed version for your release line: 10.8.10 or 13.8.1.

## Is CVE-2025-46736 being exploited?

There is no known exploitation of CVE-2025-46736 in the wild and no public exploit code.

## Other vulnerabilities in Umbraco Umbraco Cms

- [CVE-2025-67288](https://insights.sbomify.com/CVE-2025-67288/): Umbraco CMS has an arbitrary file upload vulnerability (critical 10.0)
- [CVE-2014-10074](https://insights.sbomify.com/CVE-2014-10074/): File upload in n/a (critical 9.8)
- [CVE-2012-1301](https://insights.sbomify.com/CVE-2012-1301/): Server-side request forgery in n/a (critical 9.8)
- [CVE-2012-10054](https://insights.sbomify.com/CVE-2012-10054/): Umbraco CMS < 4.7.1 codeEditorSave.asmx RCE (critical 9.3)
- [CVE-2025-32017](https://insights.sbomify.com/CVE-2025-32017/): Umbraco has a Management API Vulnerability to Path Traversal With Authenticated Users (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-46736 and fix it if it is affected.

What it is: CVE-2025-46736 is a medium-severity vulnerability in Umbraco Umbraco Cms, published on 6 May 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-46736 in the wild and no public exploit code.

Affected packages and fixed versions:
- Umbraco.Cms (NuGet): affected all versions; fixed in 10.8.10
- Umbraco.Cms (NuGet): affected all versions; fixed in 10.8.10
- Umbraco.Cms (NuGet): affected from 11.0.0-rc1; fixed in 13.8.1
- Umbraco.Cms (NuGet): affected from 11.0.0-rc1; fixed in 13.8.1

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-46736/ (Markdown: https://insights.sbomify.com/CVE-2025-46736/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-46736
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-46736
- OSV: https://osv.dev/vulnerability/CVE-2025-46736

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-46736/
Summaries are generated and may contain mistakes; the official description above is the record.