CVE-2024-29035

Blind SSRF Leads to Port Scan by using Webhooks

Affected Versions

Umbraco versions 13.0.0 - 13.1.1

Workarounds

Disabling webhooks functionality.

Failing webhooks logs are available when solution is not in debug mode. Those logs can contain information that is critical.

Untrusted input controls the target URL of a server-initiated request, which may reach internal services not otherwise accessible from outside. Typical impact: access to internal metadata services, internal APIs, or cloud credentials.

CVE-2024-29035 has a CVSS score of 4.1 (Medium). The vector is network-reachable, high privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (13.1.1); upgrading removes the vulnerable code path.

Kodem intelligence

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13.1.1

1. What is CVE-2024-29035? CVE-2024-29035 is a medium-severity server-side request forgery (SSRF) vulnerability in Umbraco.Cms.Core (nuget), affecting versions >= 13.0.0, < 13.1.1. It is fixed in 13.1.1. Untrusted input controls the target URL of a server-initiated request, which may reach internal services not otherwise accessible from outside.
2. How severe is CVE-2024-29035? CVE-2024-29035 has a CVSS score of 4.1 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which packages are affected by CVE-2024-29035?
   • Umbraco.Cms.Core (nuget) (versions >= 13.0.0, < 13.1.1)
   • Umbraco.Cms.Web.BackOffice (nuget) (versions >= 13.0.0, < 13.1.1)
4. Is there a fix for CVE-2024-29035? Yes. CVE-2024-29035 is fixed in 13.1.1. Upgrade to this version or later.
5. Is CVE-2024-29035 exploitable, and should I be worried? Whether CVE-2024-29035 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2024-29035 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2024-29035?
   • Upgrade Umbraco.Cms.Core to 13.1.1 or later
   • Upgrade Umbraco.Cms.Web.BackOffice to 13.1.1 or later

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