CVE-2026-41692

Description

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 — it does not validate the URL scheme of the substituted value. A translated value such as javascript:alert(1) or data:text/html,<script>...</script> is applied unchanged to the live DOM attribute when an attacker can influence the content of a translation file or the translation-backend response — 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.

CVSS Details

CVSS Score

4.7

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

Configurations (Affected Products)

No configuration data available.

i18nextify < 4.0.8

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

// Malicious translation payload example
// Inject this into the translation JSON backend
{
  "translation": {
    "download_link": "javascript:alert('CVE-2026-41692_PoC')"
  }
}

// HTML Template processed by i18nextify
// <a href="{{download_link}}">Download</a>

// Resulting DOM after vulnerable processing:
// <a href="javascript:alert('CVE-2026-41692_PoC')">Download</a>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-41692
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-41692
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-41692/
[4] VulDB https://vuldb.com/cve/CVE-2026-41692
[5] https://github.com/i18next/i18nextify/commit/16f23dbcdcf893673587f7a03355bf7ce0a0e49e
[6] https://github.com/i18next/i18nextify/security/advisories/GHSA-6457-mxpq-4fqq

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-41692", "sourceIdentifier": "[email protected]", "published": "2026-05-07T21:16:29.717", "lastModified": "2026-05-08T16:05:43.103", "vulnStatus": "Awaiting Analysis", "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 — it does not validate the URL scheme of the substituted value. A translated value such as javascript:alert(1) or data:text/html,<script>...</script> is applied unchanged to the live DOM attribute when an attacker can influence the content of a translation file or the translation-backend response — 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."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N", "baseScore": 4.7, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.6, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}, {"lang": "en", "value": "CWE-94"}]}], "references": [{"url": "https://github.com/i18next/i18nextify/commit/16f23dbcdcf893673587f7a03355bf7ce0a0e49e", "source": "[email protected]"}, {"url": "https://github.com/i18next/i18nextify/security/advisories/GHSA-6457-mxpq-4fqq", "source": "[email protected]"}]}}