Vulnerability in Umbraco-CMS

[ Description ]Official 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can complete the SignalR negotiate step and receive refreshed notifications that disclose content keys, including unpublished content, and reveal editorial activity timing.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• github.com/umbraco/Umbraco-CMS/blob/release-18.2.0/src/Umbraco.Cms.Api.Management/Previ…
• github.com/umbraco/Umbraco-CMS/blob/release-18.2.0/src/Umbraco.Cms.Api.Management/Previ…
• github.com/umbraco/Umbraco-CMS/commit/243e082479c777d0f585bbd2f8db571607767b22
• github.com/umbraco/Umbraco-CMS/commit/b4f6cfc9d0955f9d8443e68353db4a692e91bd94
• github.com/umbraco/Umbraco-CMS/releases/tag/release-17.7.1
• github.com/umbraco/Umbraco-CMS/releases/tag/release-18.2.1
• github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-4c5q-6c64-96j7
• www.vulncheck.com/advisories/umbraco-cms-before-17.7.1-and-18.2.1-missing-authorization…