CVE-2026-111624 — Umbraco CMS before 17.7.1 and 18.2.1 Missing Authorization on SignalR Hubs
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…
Published: 2026-10-16 · CVSS: 6.3 · CVSS 4.0
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can complete the SignalR negotiate step and receive refreshed notifications that disclose content keys, including unpublished content, and reveal editorial activity timing.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7