# CVE-2019-1010199: Cross site scripting attack in ServiceStack Framework

> Reflected XSS in ServiceStack Framework allows attackers to execute JavaScript in victims' browsers via crafted URLs.

- **Severity:** Medium 6.1 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 23 Jul 2019
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-vcfc-9wcp-j623

## What is CVE-2019-1010199?

CVE-2019-1010199 is a medium-severity cross-site scripting vulnerability in ServiceStack Framework, published on 23 Jul 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

ServiceStack ServiceStack Framework 4.5.14 is affected by: Cross Site Scripting (XSS). The impact is: JavaScrpit is reflected in the server response, hence executed by the browser. The component is: the query used in the GET request is prone. The attack vector is: Since there is no server-side validation and If Browser encoding is bypassed, the victim is affected when opening a crafted URL. The fixed version is: 5.2.0.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2019-1010199?

2 open source packages ship an affected version, including ServiceStack. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `ServiceStack` | NuGet | From 4.5.14 | 5.2.0 |
| `ServiceStack` | NuGet | From 4.5.14 | 5.2.0 |

Products: Servicestack Servicestack.

## How do I fix CVE-2019-1010199?

Upgrade ServiceStack to 5.2.0 or later.

## Is CVE-2019-1010199 being exploited?

There is no known exploitation of CVE-2019-1010199 in the wild and no public exploit code.

## Other vulnerabilities in ServiceStack Framework

- [CVE-2025-6445](https://insights.sbomify.com/CVE-2025-6445/): ServiceStack FindType Directory Traversal Remote Code Execution Vulnerability (high 8.1)
- [CVE-2025-6444](https://insights.sbomify.com/CVE-2025-6444/): ServiceStack GetErrorResponse Improper Input Validation NTLM Relay Vulnerability (medium 5.9)
- [CVE-2020-28042](https://insights.sbomify.com/CVE-2020-28042/): Signature validation bypass in ServiceStack (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-1010199 and fix it if it is affected.

What it is: CVE-2019-1010199 is a medium-severity cross-site scripting vulnerability in ServiceStack Framework, published on 23 Jul 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2019-1010199 in the wild and no public exploit code.

Affected packages and fixed versions:
- ServiceStack (NuGet): affected from 4.5.14; fixed in 5.2.0
- ServiceStack (NuGet): affected from 4.5.14; fixed in 5.2.0

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-2019-1010199/ (Markdown: https://insights.sbomify.com/CVE-2019-1010199/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-1010199
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-1010199
- OSV: https://osv.dev/vulnerability/CVE-2019-1010199

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-1010199/
Summaries are generated and may contain mistakes; the official description above is the record.