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Improper Access Control


Severity High
Score 9.8/10


Umbraco is a ASP.NET CMS. Under rare conditions a restart of Umbraco can allow unauthorized users access to admin-level permissions. This vulnerability affects "Umbraco.Cms.Infrastructure" and "Umbraco.Cms.Web.BackOffice" packages versions 9.0.0-beta001 through 10.6.0, 11.0.0-rc1 through 11.4.1, and 12.0.0-rc1 through 12.0.0.

  • LOW
  • HIGH
  • NONE
  • NONE
  • HIGH
  • HIGH

CWE-284 - Improper Access Control

Listed 5th in the 'OWASP Top Ten', improper (or broken) access control attacks are a fundamental type of vulnerability. This includes a broad range of design flaws that enable users to act outside of their intended permissions. They can use these privileges to gain access to restricted files and functionality such as accessing restricted information, falsifying records, destroying data, or executing commands.

Advisory Timeline

  • Published