Umbraco CMS vulnerable to stored XSS via SVG File Upload
Priority LOW 25CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
Umbraco is an ASP.NET content management system (CMS). Starting in version 7.0.0 and prior to versions 7.15.11, 8.18.9, 10.7.0, 11.5.0, and 12.2.0, a user with access to the backoffice can upload SVG files that include scripts. If the user can trick another user to load the media directly in a browser, the scripts can be executed. Versions 7.15.11, 8.18.9, 10.7.0, 11.5.0, and 12.2.0 contain a patch for this issue. Some workarounds are available. Implement the server side file validation or serve all media from an different host (e.g cdn) than where Umbraco is hosted.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0039 33rd percentileScored 2026-11-07
Fix Fixed Umbraco-CMS (umbraco): 7.15.11, 8.18.9, 10.7.0 +2Umbraco.CMS (NuGet): 7.15.11, 8.18.9, 10.7.0 +2
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| umbraco | Umbraco-CMS | 7.0.0 to before 7.15.11; 8.0.0 to before 8.18.9; 9.0.0-rc001 to before 10.7.0; 11.0.0-rc1 to before 11.5.0; 12.0.0-rc1 to before 12.2.0 | 7.15.11, 8.18.9, 10.7.0, 11.5.0, 12.2.0 | Patch available | CNA |
| — | Umbraco.CMS (NuGet) | 7.0.0 to before 7.15.11 | 7.15.11 | Patch available | GHSA-6xmx-85x3-4cv2 |
| — | Umbraco.CMS (NuGet) | 8.0.0 to before 8.18.9 | 8.18.9 | Patch available | GHSA-6xmx-85x3-4cv2 |
| — | Umbraco.CMS (NuGet) | 9.0.0 to before 10.7.0 | 10.7.0 | Patch available | GHSA-6xmx-85x3-4cv2 |
| — | Umbraco.CMS (NuGet) | 11.0.0 to before 11.5.0 | 11.5.0 | Patch available | GHSA-6xmx-85x3-4cv2 |
| — | Umbraco.CMS (NuGet) | 12.0.0 to before 12.2.0 | 12.2.0 | Patch available | GHSA-6xmx-85x3-4cv2 |
- Umbraco-CMS Vendorumbraco Affected 7.0.0 to before 7.15.11; 8.0.0 to before 8.18.9; 9.0.0-rc001 to before 10.7.0; 11.0.0-rc1 to before 11.5.0; 12.0.0-rc1 to before 12.2.0 Fixed in 7.15.11, 8.18.9, 10.7.0, 11.5.0, 12.2.0 Patch available CNA
- Umbraco.CMS (NuGet) Vendor— Affected 7.0.0 to before 7.15.11 Fixed in 7.15.11 Patch available GHSA-6xmx-85x3-4cv2
- Umbraco.CMS (NuGet) Vendor— Affected 8.0.0 to before 8.18.9 Fixed in 8.18.9 Patch available GHSA-6xmx-85x3-4cv2
- Umbraco.CMS (NuGet) Vendor— Affected 9.0.0 to before 10.7.0 Fixed in 10.7.0 Patch available GHSA-6xmx-85x3-4cv2
- Umbraco.CMS (NuGet) Vendor— Affected 11.0.0 to before 11.5.0 Fixed in 11.5.0 Patch available GHSA-6xmx-85x3-4cv2
- Umbraco.CMS (NuGet) Vendor— Affected 12.0.0 to before 12.2.0 Fixed in 12.2.0 Patch available GHSA-6xmx-85x3-4cv2
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:* | 7.0.0 to before 7.15.11; 8.0.0 to before 8.18.9; 10.0.0 to before 10.7.0; 11.0.0 to before 11.5.0; 12.0.0 to before 12.2.0 | Vulnerable | umbraco |
- cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:* Versions 7.0.0 to before 7.15.11; 8.0.0 to before 8.18.9; 10.0.0 to before 10.7.0; 11.0.0 to before 11.5.0; 12.0.0 to before 12.2.0 Vulnerable ·umbraco
Remediation
- Fix · CNA Umbraco-CMS (umbraco) Fixed in 7.15.11, 8.18.9, 10.7.0, 11.5.0, 12.2.0
- Fix · GHSA-6xmx-85x3-4cv2 Umbraco.CMS (NuGet) Fixed in 7.15.11 Advisory →
- Fix · GHSA-6xmx-85x3-4cv2 Umbraco.CMS (NuGet) Fixed in 8.18.9 Advisory →
- Fix · GHSA-6xmx-85x3-4cv2 Umbraco.CMS (NuGet) Fixed in 10.7.0 Advisory →
- Fix · GHSA-6xmx-85x3-4cv2 Umbraco.CMS (NuGet) Fixed in 11.5.0 Advisory →
- Fix · GHSA-6xmx-85x3-4cv2 Umbraco.CMS (NuGet) Fixed in 12.2.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2023-49279
- 2026-10-03 Alias added: GHSA-6xmx-85x3-4cv2
References
More Umbraco Cms vulnerabilities
- TI-2025-41183 An arbitrary file upload vulnerability in Umbraco CMS v16.3.3 allows attackers to execute… CVSS 3.1CRITICAL 10.0
- TI-2012-05477 Umbraco CMS < 4.7.1 codeEditorSave.asmx RCE CVSS 4.0CRITICAL 9.3
- TI-2021-22392 Umbraco v8.14.1 - 'baseUrl' SSRF CVSS 4.0MEDIUM 6.9
- TI-2024-36846 A stored cross-site scripting (XSS) vulnerability in Umbraco CMS v14.3.1 allows attackers… CVSS 3.1MEDIUM 6.5
- TI-2019-15240 Umbraco CMS 4.11.8 through 7.15.10, and 7.12.4, allows Remote Code Execution by… CVSS 3.1HIGH 7.2
- TI-2020-04738 Cross-site scripting in Umbraco CMS CVSS 3.1MEDIUM 5.4
Sources
- CVE-2023-49279 · CVE Program
- CVE-2023-49279 · NVD
- FIRST EPSS
- GHSA-6xmx-85x3-4cv2 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences