# Umbraco CMS vulnerabilities

Source: https://junglewise.ai/threats/technologies/umbraco-cms-1  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/umbraco-cms-1.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 3 vulnerabilities in Umbraco CMS: 0 in the last 7 days and 1 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-117553, was published on 27 October 2026. 1 vulnerability in the last four weeks, up from none in the four before.

## Counts

- Last 7 days: 0
- Last 30 days: 1
- Last 90 days: 1
- All time: 3 (0 critical, 0 exploited in the wild)

## Latest Umbraco CMS vulnerabilities

- [CVE-2026-117553: Umbraco CMS authentication bypass via Host header poisoning](https://junglewise.ai/threats/cve-2026-117553-umbraco-cms-before-17-7-2-and-18-2-2-contains-an-authentication) (high, CVSS 7.5, published 27 Oct 2026)
- [CVE-2021-47776: Umbraco CMS contains a server-side request forgery vulnerability](https://junglewise.ai/threats/cve-2021-47776-umbraco-cms-contains-a-server-side-request-forgery-vulnerability) (medium, CVSS 5.3, published 15 Jan 2026)
- [CVE-2025-66625: Umbraco Vulnerable to Improper File Access and Credential Exposure in Dictionary Import Functionality](https://junglewise.ai/threats/cve-2025-66625-umbraco-vulnerable-to-improper-file-access-and-credential) (medium, CVSS 4.9, published 9 Dec 2025)

## Most severe Umbraco CMS vulnerabilities

- [CVE-2026-117553: Umbraco CMS authentication bypass via Host header poisoning](https://junglewise.ai/threats/cve-2026-117553-umbraco-cms-before-17-7-2-and-18-2-2-contains-an-authentication) (high, CVSS 7.5, published 27 Oct 2026)
- [CVE-2021-47776: Umbraco CMS contains a server-side request forgery vulnerability](https://junglewise.ai/threats/cve-2021-47776-umbraco-cms-contains-a-server-side-request-forgery-vulnerability) (medium, CVSS 5.3, published 15 Jan 2026)
- [CVE-2025-66625: Umbraco Vulnerable to Improper File Access and Credential Exposure in Dictionary Import Functionality](https://junglewise.ai/threats/cve-2025-66625-umbraco-vulnerable-to-improper-file-access-and-credential) (medium, CVSS 4.9, published 9 Dec 2025)

## Vulnerabilities per week

1 vulnerability in the last four weeks, up from none in the four before.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 1 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Umbraco CMS vulnerabilities", https://junglewise.ai/threats/technologies/umbraco-cms-1, 9 November 2026.