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EUVD-2026-309185

fkie_cve-2026-41885

i18next-locize-backend is a simple i18next backend for locize.com which can be used in Node.js, in the browser and for Deno. Prior to version 9.0.2, i18next-locize-backend interpolates lng, ns, projectId, and version directly into the configured loadPath / privatePath / addPath / updatePath / getLanguagesPath URL templates with no path-component validation and no encoding. When an application exposes any of these values to user-controlled input (?lng= / ?ns= query parameters via i18next-browser-languagedetector, cookies, request headers, or a URL-derived projectId), a crafted value can change the structure of the outgoing request URL. Affected call sites in lib/index.js (pre-patch): the interpolate() helper is used at the five URL-build sites — _readAny/read (line 415 for private, 426 for public), getLanguages (lines 271 and 296), and writePage (lines 616 and 622) for the missing-key and update POST paths. The helper interpolate in lib/utils.js substitutes raw values with no encoding. This issue has been patched in version 9.0.2.

GHSA-mgcp-mfp8-3q45 — i18next-locize-backend has URL Injection via Unsanitized Path Parameters

Affected: npm: i18next-locize-backend

### Summary

Versions of `i18next-locize-backend` prior to 9.0.2 interpolate `lng`, `ns`, `projectId`, and `version` directly into the configured `loadPath` / `privatePath` / `addPath` / `updatePath` / `getLanguagesPath` URL templates with no path-component validation and no encoding. When an application exposes any of these values to user-controlled input (`?lng=` / `?ns=` query parameters via `i18next-browser-languagedetector`, cookies, request headers, or a URL-derived `projectId`), a crafted value can change the structure of the outgoing request URL.

Affected call sites in `lib/index.js` (pre-patch): the `interpolate()` helper is used at the five URL-build sites — `_readAny`/`read` (line 415 for private, 426 for public), `getLanguages` (lines 271 and 296), and `writePage` (lines 616 and 622) for the missing-key and update POST paths. The helper `interpolate` in `lib/utils.js` substitutes raw values with no encoding.

### Impact

An attacker who can influence `lng`, `ns`, `projectId`, or `version` can:

- **Path traversal** — `lng = '../../admin'` against `https://api.locize.app/{{projectId}}/{{version}}/{{lng}}/{{ns}}` changes the request URL path segment that reaches the locize CDN / API. - **Query-string injection** — `lng = 'en?x=y'` appends an attacker-chosen query to the URL. - **Fragment truncation** — `lng = 'en#x'` silently truncates the path in browser fetches. - **URL-encoded bypass** — `lng = 'en%2F..'` leverages server-side decoding to reintroduce `/..`.

Th…