Low severity3.7NVD Advisory· Published Oct 16, 2026· Updated Oct 16, 2026
CVE-2026-111624
CVE-2026-111624
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can complete the SignalR negotiate step and receive refreshed notifications that disclose content keys, including unpublished content, and reveal editorial activity timing.
Affected products
1- Range: <17.7.1 and <18.2.1
Patches
Vulnerability mechanics
References
8- github.com/umbraco/Umbraco-CMS/blob/release-18.2.0/src/Umbraco.Cms.Api.Management/Preview/PreviewHub.csnvd
- github.com/umbraco/Umbraco-CMS/blob/release-18.2.0/src/Umbraco.Cms.Api.Management/Preview/PreviewHubUpdater.csnvd
- github.com/umbraco/Umbraco-CMS/commit/243e082479c777d0f585bbd2f8db571607767b22nvd
- github.com/umbraco/Umbraco-CMS/commit/b4f6cfc9d0955f9d8443e68353db4a692e91bd94nvd
- github.com/umbraco/Umbraco-CMS/releases/tag/release-17.7.1nvd
- github.com/umbraco/Umbraco-CMS/releases/tag/release-18.2.1nvd
- github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-4c5q-6c64-96j7nvd
- www.vulncheck.com/advisories/umbraco-cms-before-17.7.1-and-18.2.1-missing-authorization-on-signalr-hubsnvd
News mentions
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