{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "i18nextify is a JavaScript library that adds website internationalization via a script tag, without source code changes. Versions prior to 4.0.8 substitute {{key}} interpolation tokens inside src and href attribute values with the raw string returned by i18next.t(). The substitution logic in src/localize.js (the replaceInside handler) only guards against a duplicated http:// origin prefix \u2014 it does not validate the URL scheme of the substituted value. A translated value such as javascript:alert(1) or data:text/html,\u003cscript\u003e...\u003c/script\u003e is applied unchanged to the live DOM attribute when an attacker can influence the content of a translation file or the translation-backend response \u2014 for example, via a compromised translation CDN, user-contributed locales, a MITM on a plain-HTTP backend, or write access to the translation JSON. This issue was patched in version 4.0.8."
    }
  ],
  "id": "CVE-2026-41692",
  "lastModified": "2026-05-08T16:05:43.103",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 4.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 2.7,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-05-07T21:16:29.717",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/i18next/i18nextify/commit/16f23dbcdcf893673587f7a03355bf7ce0a0e49e"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/i18next/i18nextify/security/advisories/GHSA-6457-mxpq-4fqq"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        },
        {
          "lang": "en",
          "value": "CWE-94"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "i18nextify"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.0.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-41692"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79",
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-22T17:42:24Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nVersions of `i18nextify` prior to 4.0.8 substitute `{{key}}` interpolation tokens inside `src` and `href` attribute values with the raw string returned by `i18next.t()`. The substitution logic in `src/localize.js` (`replaceInside` handler around line 122) only guards against a duplicated `http://` origin prefix \u2014 it does not validate the URL scheme of the substituted value. A translated value such as `javascript:alert(1)` or `data:text/html,\u003cscript\u003e...\u003c/script\u003e` is applied unchanged to the live DOM attribute.\n\n### Impact\n\nWhen an attacker can influence the content of a translation file or the translation-backend response \u2014 compromised translation CDN, user-contributed locales, MITM on a plain-HTTP backend, write access to the translation JSON \u2014 they can:\n\n- Set any `href` on an anchor to a `javascript:` URI, executing arbitrary JavaScript when the victim clicks the link.\n- Set any `src` on `\u003ciframe\u003e`, `\u003cobject\u003e`, or `\u003cembed\u003e` to a `data:text/html` URI containing a full script payload that runs in the page\u0027s origin.\n- Use `vbscript:` on legacy IE installations or `file:` for local-resource navigation attacks.\n\nThis path is distinct from the general i18nextify design that intentionally renders HTML from translations \u2014 href/src schemes are narrow and attack-specific, and no legitimate translation needs `javascript:` or `data:`. The fix therefore blocks these schemes outright without changing other behaviour.\n\n### Also fixed in 4.0.8\n\n- **`debug` / `saveMissing` URL-parameter substring match.** The previous detection `window.location.search.indexOf(\u0027debug=true\u0027) \u003e -1` matched the substring anywhere in the query string. A URL like `?nosaveMissing=true` silently enabled `saveMissing` mode, causing the victim\u0027s browser to POST every unknown translation key to the configured `addPath` \u2014 a form of CSRF-style abuse of missing-key reporting. `?track_debug=true` enabled verbose debug logging, leaking i18next internals to the console. Now uses `URLSearchParams` for exact parameter matching.\n- **Optional `sanitize(html, ctx)` hook.** The library\u0027s core purpose is to render HTML from translations \u2014 a behaviour that is safe only when the translation source is fully trusted. Applications with partially-trusted sources (user-contributed locales, third-party CDN, MITM-exposed HTTP backend) can now wire a sanitizer (e.g. DOMPurify) via `i18next.options.sanitize`. Defaults to pass-through to preserve existing behaviour for the main use case.\n\n### Affected versions\n\nAll versions of `i18nextify` prior to **4.0.8**.\n\n### Patch\n\nFixed in **4.0.8**. The URL-scheme blocklist is `^\\s*(javascript|data|vbscript|file)\\s*:` (case-insensitive) applied to each translated value before it is joined back into the `href`/`src` attribute. Values matching the blocklist are replaced with an empty string so the attribute becomes harmless rather than leaving the attacker\u0027s URL in place.\n\n### Workarounds\n\nNo workaround short of upgrading. If you cannot upgrade immediately, audit every translation file for `javascript:`, `data:`, `vbscript:`, and `file:` prefixes in any value that may reach an `href`/`src` position, and restrict translation-file write access to trusted operators. Serving translations over HTTPS and pinning the translation backend to an internal origin reduce the MITM surface.\n\n### Credits\n\nDiscovered via an internal security audit of the i18next ecosystem.",
  "id": "GHSA-6457-mxpq-4fqq",
  "modified": "2026-04-30T20:16:05Z",
  "published": "2026-04-22T17:42:24Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/i18next/i18nextify/security/advisories/GHSA-6457-mxpq-4fqq"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/i18next/i18nextify"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "i18nextify has DOM XSS via javascript:/data: URL schemes in translated href/src attributes"
}