Umbraco CMS vulnerabilities: known CVEs & security history
Umbraco · CMS · 6 tracked CVEs · 0 actively exploited · updated November 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all Umbraco CMS release lines — 6 in total. A CVE here doesn't mean your version is affected — check Umbraco CMS's current status and the safe version to run.
Known Umbraco CMS CVEs
Actively-exploited and most-severe first. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2025-67288 | critical | 10 | 1% | 2025 |
| CVE-2024-55488 | medium | 6.5 | 0% | 2025 |
| CVE-2026-46616 | medium | 5.4 | 0% | 2026 |
| CVE-2021-47776 | medium | 5.3 | 0% | 2026 |
| CVE-2025-66625 | medium | 4.9 | 0% | 2025 |
| CVE-2026-46609 | medium | 4.6 | 0% | 2026 |
Is my Umbraco CMS version affected?
The list above spans every release. To know whether your version is affected — and the minimum safe version to upgrade to — check it directly.
Check your Umbraco CMS version → · Monitor Umbraco CMS for new CVEs →
Umbraco CMS vulnerabilities — frequently asked
How many known vulnerabilities does Umbraco CMS have?
IsItPatched tracks 6 CVEs for Umbraco CMS. 1 is critical-severity and 0 high-severity. These span every release line — what matters is whether the version you run is affected.
Does Umbraco CMS have any actively-exploited vulnerabilities?
None of Umbraco CMS's tracked CVEs are currently in CISA's KEV catalog — but new ones can be added at any time, so keep your version current.
What is the most severe Umbraco CMS vulnerability?
Among tracked issues, CVE-2025-67288 (CRITICAL, CVSS 10) ranks highest — a Unrestricted file upload weakness.
Is Umbraco CMS safe to use?
It depends on the version. The latest supported Umbraco CMS release (18.3.0) clears the known issues; older versions may still be affected. Check the exact version you run for a verdict.
CVE data aggregated from NVD, CISA KEV and EPSS (FIRST.org). Related: Umbraco CMS security status · Umbraco CMS end-of-life · actively-exploited CVEs. Always verify against Umbraco's advisories — see our disclaimer.