CVE-2026-111624
LOW
CVSS 3.7
Published: 2026-10-16
Modified: 2026-10-16
Tenable Plugin
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Threat Intelligence Pending
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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can complete the SignalR negotiate step and receive refreshed notifications that disclose content keys, including unpublished content, and reveal editorial activity timing.
Quick Facts
| CVE ID | CVE-2026-111624 |
| CVSS Score | 3.7 |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N |
| Published | 2026-10-16 |
| Exploited | No |
| CISA KEV | No |
| PoC | Not public |
References
- https://github.com/umbraco/Umbraco-CMS/blob/release-18.2.0/s…
- https://github.com/umbraco/Umbraco-CMS/blob/release-18.2.0/s…
- https://github.com/umbraco/Umbraco-CMS/commit/243e082479c777…
- https://github.com/umbraco/Umbraco-CMS/commit/b4f6cfc9d0955f…
- https://github.com/umbraco/Umbraco-CMS/releases/tag/release-…
- https://github.com/umbraco/Umbraco-CMS/releases/tag/release-…
- https://github.com/umbraco/Umbraco-CMS/security/advisories/G…
- https://www.vulncheck.com/advisories/umbraco-cms-before-17.7…