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Advisories

Umbraco CMS before 17.7.1 and 18.2.1 Missing Authorization on SignalR Hubs

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Severity
medium
Date
Affecting

  • Umbraco-CMS >= 17.0.0, < 17.7.1

  • Umbraco-CMS >= 18.0.0, < 18.2.1

CWE
  • CWE-306 Missing Authentication for Critical Function
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Credit
lichoin
Description
Umbraco CMS before 17.7.1 and 18.2.1 contains a missing authorization vulnerability that allows unauthenticated clients to connect to the backoffice PreviewHub and BackofficeHub SignalR hubs. Attackers can complete the SignalR negotiate step and receive refreshed notifications that disclose content keys, including unpublished content, and reveal editorial activity timing.

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