fkie_cve-2026-54660

swagger-typescript-api generates API clients for Fetch or Axios from OpenAPI specifications. Prior to 13.12.2, src/resolved-swagger-schema.ts getRemoteRequestHeaders forwards --authorizationToken to every URL fetched by fetchRemoteSchemaDocument while warmUpRemoteSchemasCache resolves external $ref URLs, allowing an attacker-controlled OpenAPI spec to exfiltrate the developer or CI bearer token to a cross-origin endpoint. This issue is fixed in version 13.12.2.

GHSA-h754-fxp7-88wx — swagger-typescript-api vulnerable to authorization-token exfiltration via spec `$ref`

Affected: npm: swagger-typescript-api

### Summary

When the developer supplies an `--authorizationToken` (commonly required to fetch a private spec behind authentication), `swagger-typescript-api` attaches that token to the `Authorization` header of **every** subsequent HTTP request it makes while resolving external `$ref` URLs in the spec — with **no same-origin check, no host allowlist, and no scope-down** for cross-origin requests. A malicious OpenAPI spec containing a `$ref` to an attacker-controlled URL therefore causes the developer's bearer token to be sent verbatim to that URL during code generation.

The threat model is identical to the SSRF advisory filed alongside this one (companion finding), but with credential disclosure as the primary impact. The token is typically a high-value secret: a GitHub PAT, an OAuth bearer for the API the spec describes, an enterprise SSO token, an AWS-style API key, or similar. Disclosure to an attacker-controlled URL is one curl-equivalent away from full takeover of whatever scope the token grants.

### Details

The header-builder lives in `src/resolved-swagger-schema.ts:81-92`:

```ts private getRemoteRequestHeaders(): Record<string, string> { return Object.assign( {}, this.config.authorizationToken ? { Authorization: this.config.authorizationToken, } : {}, (this.config.requestOptions?.headers as | Record<string, string> | undefined) || {}, ); } ```

There is no check that the request's destination URL shares an…

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fkie_cve-2026-54660

GHSA-h754-fxp7-88wx — swagger-typescript-api vulnerable to authorization-token exfiltration via spec `$ref`