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

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

Which versions are affected by CVE-2019-1010199?

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

Products include Servicestack Servicestack.

How do I fix CVE-2019-1010199?

Upgrade ServiceStack to 5.2.0 or later.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

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 ServiceStack FindType Directory Traversal Remote Code Execution Vulnerability High 8.1
• CVE-2025-6444 ServiceStack GetErrorResponse Improper Input Validation NTLM Relay Vulnerability Medium 5.9
• CVE-2020-28042 Signature validation bypass in ServiceStack Medium 5.3

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-vcfc-9wcp-j623.