# CVE-2024-29035: Umbraco's Blind SSRF Leads to Port Scan by using Webhooks

> Attackers can perform blind SSRF port scans via webhooks in Umbraco CMS, potentially exposing critical information from logs.

- **Severity:** Medium 4.1 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 17 Apr 2024
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-74p6-39f2-23v3

## What is CVE-2024-29035?

CVE-2024-29035 is a medium-severity server-side request forgery vulnerability in Umbraco Umbraco Cms, published on 17 Apr 2024. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Umbraco is an ASP.NET CMS. Failing webhooks logs are available when solution is not in debug mode. Those logs can contain information that is critical. This vulnerability is fixed in 13.1.1.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2024-29035?

4 open source packages ship an affected version, including Umbraco.Cms.Core and Umbraco.Cms.Web.BackOffice. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `Umbraco.Cms.Core` | NuGet | From 13.0.0 | 13.1.1 |
| `Umbraco.Cms.Core` | NuGet | From 13.0.0 | 13.1.1 |
| `Umbraco.Cms.Web.BackOffice` | NuGet | From 13.0.0 | 13.1.1 |
| `Umbraco.Cms.Web.BackOffice` | NuGet | From 13.0.0 | 13.1.1 |

Products: Umbraco Umbraco Cms.

## How do I fix CVE-2024-29035?

Upgrade Umbraco.Cms.Core to 13.1.1 or later.

## Is CVE-2024-29035 being exploited?

There is no known exploitation of CVE-2024-29035 in the wild and no public exploit code.

## Other vulnerabilities in Umbraco Umbraco Cms

- [CVE-2025-67288](https://insights.sbomify.com/CVE-2025-67288/): Umbraco CMS has an arbitrary file upload vulnerability (critical 10.0)
- [CVE-2014-10074](https://insights.sbomify.com/CVE-2014-10074/): File upload in n/a (critical 9.8)
- [CVE-2012-1301](https://insights.sbomify.com/CVE-2012-1301/): Server-side request forgery in n/a (critical 9.8)
- [CVE-2012-10054](https://insights.sbomify.com/CVE-2012-10054/): Umbraco CMS < 4.7.1 codeEditorSave.asmx RCE (critical 9.3)
- [CVE-2025-32017](https://insights.sbomify.com/CVE-2025-32017/): Umbraco has a Management API Vulnerability to Path Traversal With Authenticated Users (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-29035 and fix it if it is affected.

What it is: CVE-2024-29035 is a medium-severity server-side request forgery vulnerability in Umbraco Umbraco Cms, published on 17 Apr 2024. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-29035 in the wild and no public exploit code.

Affected packages and fixed versions:
- Umbraco.Cms.Core (NuGet): affected from 13.0.0; fixed in 13.1.1
- Umbraco.Cms.Core (NuGet): affected from 13.0.0; fixed in 13.1.1
- Umbraco.Cms.Web.BackOffice (NuGet): affected from 13.0.0; fixed in 13.1.1
- Umbraco.Cms.Web.BackOffice (NuGet): affected from 13.0.0; fixed in 13.1.1

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2024-29035/ (Markdown: https://insights.sbomify.com/CVE-2024-29035/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-29035
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-29035
- OSV: https://osv.dev/vulnerability/CVE-2024-29035

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-29035/
Summaries are generated and may contain mistakes; the official description above is the record.