CVE-2015-8813 is a high-severity (CVSS 8.2) Server-Side Request Forgery (SSRF) vulnerability in Umbraco.CMS. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for Umbraco.CMS — see the affected versions and patch details below.
Umbraco CMS vulnerable to CSRF
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
Umbraco.CMSReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.
Description
The Page_Load function in Umbraco.Web/umbraco.presentation/umbraco/dashboard/FeedProxy.aspx.cs in Umbraco before 7.4.0 allows remote attackers to conduct server-side request forgery (SSRF) attacks via the url parameter.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| .NETNuGet | Umbraco.CMS | all versions | 7.4.0dotnet add package Umbraco.CMS --version 7.4.0 |
Affected Products
umbracoumbracoResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for Umbraco.CMS, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update Umbraco.CMS to 7.4.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2015-8813 is resolved across your whole dependency graph.
Workarounds
Restrict outbound requests from the affected component to an allowlist of hosts, block access to link-local and internal address ranges at the network layer, and require authentication on internal services so a forged request cannot reach them unauthenticated.
How to detect CVE-2015-8813
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2015-8813 -u https://target- Template
- Umbraco <7.4.0- Server-Side Request Forgery
- Severity
- high
- Impact
- The vulnerability can result in unauthorized access to sensitive information or systems, leading to potential data breaches or further exploitation.
- Remediation
- Upgrade Umbraco to version 7.4.0 or above to mitigate the vulnerability and apply any necessary patches or security updates.
Template by ProjectDiscovery nuclei-templates (emadshanab), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2015-8813 in your dependencies?
Find it across NuGet, including transitive dependencies.