Christian Helle Refitter up to 2.1.0 Ref Resolution server-side request forgery

Summaryinfo

A vulnerability was found in Christian Helle Refitter up to 2.1.0. It has been rated as critical. Affected by this vulnerability is an unknown functionality of the component Ref Resolution. Performing a manipulation results in server-side request forgery. This vulnerability is cataloged as CVE-2026-63184. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, was found in Christian Helle Refitter up to 2.1.0. This affects an unknown function of the component Ref Resolution. The manipulation with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Refitter is a tool for generating a C# REST API client using the Refit library. Prior to 2.1.1, the `refitter` dotnet tool invokes `NJsonSchema` with unsafe defaults for `$ref` resolution when generating Refit interfaces and contracts from attacker-controlled or attacker-influenced OpenAPI descriptions. Remote `http(s)` references cause requests from the developer or CI host and inline untrusted remote schema content into generated output. Absolute local file paths and relative `../` traversal outside the input directory also resolve and inline local content, permitting arbitrary local-file disclosure. The demonstrated chain stops at server-side request forgery, remote file inclusion, and local file inclusion, not code execution: Refit sets the base URL at runtime, enum values use verbatim-string doubling, and string defaults are escaped. This issue is fixed in version 2.1.1.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-63184 since 07/16/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available.

Upgrading to version 2.1.1 eliminates this vulnerability.

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Productinfo

Vendor

• Christian Helle

Name

• Refitter

Version

• 2.0
• 2.1.0

CPE 2.3info

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CPE 2.2info

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