{"id":"CVE-2026-111624","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-111624","generatedAt":"2026-10-28T02:14:27.313Z","title":"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.","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can complete the SignalR negotiate step and receive refreshed notifications that disclose content keys, including unpublished content, and reveal editorial activity timing.","published":"2026-10-16T18:17:42.000Z","lastModified":"2026-10-21T21:17:53.000Z","status":"Awaiting Analysis","sourceIdentifier":"disclosure@vulncheck.com","cvss":{"version":"4.0","score":6.3,"severity":"MEDIUM","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-306"],"affected":[],"epss":{"score":0.00309,"percentile":0.23555,"date":"2026-10-26","history":[{"date":"2026-10-17","score":0.00309,"percentile":0.22223}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.31%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-16T18:17:42.000Z","detail":{"score":"6.3","severity":"MEDIUM","publishedAt":"2026-10-16T18:17:42.280Z"},"summary":"New CVE, medium severity (CVSS 6.3)."}],"references":[{"url":"https://github.com/umbraco/Umbraco-CMS/blob/release-18.2.0/src/Umbraco.Cms.Api.Management/Preview/PreviewHub.cs#L9-L11","source":"disclosure@vulncheck.com"},{"url":"https://github.com/umbraco/Umbraco-CMS/blob/release-18.2.0/src/Umbraco.Cms.Api.Management/Preview/PreviewHubUpdater.cs#L58","source":"disclosure@vulncheck.com"},{"url":"https://github.com/umbraco/Umbraco-CMS/commit/243e082479c777d0f585bbd2f8db571607767b22","source":"disclosure@vulncheck.com"},{"url":"https://github.com/umbraco/Umbraco-CMS/commit/b4f6cfc9d0955f9d8443e68353db4a692e91bd94","source":"disclosure@vulncheck.com"},{"url":"https://github.com/umbraco/Umbraco-CMS/releases/tag/release-17.7.1","source":"disclosure@vulncheck.com"},{"url":"https://github.com/umbraco/Umbraco-CMS/releases/tag/release-18.2.1","source":"disclosure@vulncheck.com"},{"url":"https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-4c5q-6c64-96j7","source":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/umbraco-cms-before-17.7.1-and-18.2.1-missing-authorization-on-signalr-hubs","source":"disclosure@vulncheck.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-111624","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}