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Umbraco CMS before 17.7.1 and 18.2.1 Missing Authorization on SignalR Hubs

Type: advisorySource: Official CVE List1 source record

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can complete the SignalR negotiate step and receive refreshed notifications that disclose content keys, including unpublished content, and reveal editorial activity timing.

Announced Source revision 1
Original source ↗

CVE-2026-111624

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-111624

Umbraco-CMS

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://github.com/umbraco/Umbraco-CMS",
    "vendor": "umbraco",
    "product": "Umbraco-CMS",
    "versions": [
      {
        "status": "affected",
        "version": "17.0.0",
        "lessThan": "17.7.1",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "18.0.0",
        "lessThan": "18.2.1",
        "versionType": "semver"
      }
    ],
    "packageURL": "pkg:github/umbraco/Umbraco-CMS",
    "defaultStatus": "unaffected"
  }
]
Related CVEs
CVE-2026-111624

Source reference: /cveMetadata/cveId

Publisher severity

medium

Source reference: /containers/cna/metrics

Event
#49468 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement