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  4. CVE 2026 111624 umbraco cms before 1771 and 1821 missing
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Back to active CVEs
Medium · CVSS 6.3CVE-2026-111624

Umbraco CMS before 17.7.1 and 18.2.1 Missing Authorization on SignalR HubsCVE-2026-111624

Answer in brief

CVE-2026-111624 records a Medium severity (CVSS 6.3) vulnerability in Umbraco CMS before 17.7.1 and 18.2.1 Missing Authorization on SignalR Hubs. The current sources do not mark it as known exploited. The current feed maps umbraco/Umbraco-CMS (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 16, 2026Updated Oct 16, 2026Source checked Oct 16, 2026First seen by HOL Oct 16, 2026Material review Oct 16, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 6.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps umbraco/Umbraco-CMS (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
umbraco/Umbraco-CMSgeneric>=17.0.0 <17.7.1 || >=18.0.0 <18.2.117.7.1, 18.2.1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for umbraco/Umbraco-CMS.
  2. 2Review the reported fix. Update umbraco/Umbraco-CMS to 17.7.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 16, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 16, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 16, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • qKnow through 2.4.3 Missing Authentication via /flyflow Workflow EndpointsAlso CWE-306
  • Niefy wx-api through 0.8.2 Authentication Bypass via Unverified openid CookieAlso CWE-306
  • OtterMind Nubase through 0.1.4 Missing Authentication in Storage Object APIAlso CWE-306
  • LangChat through commit 2a6285a Missing Authentication on REST API ControllersAlso CWE-306
  • 99AI through 4.3.0 Unauthenticated Information Disclosure via chatLog exportExcelAlso CWE-306
  • Roncoo-pay through commit 9428382 Information Disclosure via /f2fPay/order/queryAlso CWE-306

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-306
Source
CVE List V5
Source checked
Oct 16, 2026
References
8 linked sources
Open source record