i18nextify has DOM XSS via javascript:/data: URL schemes in translated href/src attributes

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2026-41692: 0.14% estimated exploitation activity in the next 30 days; percentile 3.72 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary Versions 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 — 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. Impact When an attacker can influence the content of a translation file or the translation-backend response — compromised translation CDN, user-contributed locales, MITM on a plain-HTTP backend, write access to the translation JSON — they can: - Set any href on an anchor to a javascript: URI, executing arbitrary JavaScript when the victim clicks the link. - Set any src on <iframe, <object, or <embed to a data:text/html URI containing a full script payload that runs in the page's origin. - Use…

Published by the source

22 Apr 2026, 17:42 UTC

Last modified by the source

11 May 2026, 13:53 UTC

Source last checked

26 Oct 2026, 12:51 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-6457-mxpq-4fqq

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-6457-mxpq-4fqq

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# Patch Next advisory brief: CVE-2026-41692

Advisory: i18nextify has DOM XSS via javascript:/data: URL schemes in translated href/src attributes
IDs: CVE-2026-41692, GHSA-6457-mxpq-4fqq
Record: https://patchnext.com/advisories/cve-2026-41692 (revision 2, source checked 26 Oct 2026, 12:51 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: i18nextify 4.0.8. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm i18nextify: affected < 4.0.8; fixed in 4.0.8

## Suggested inspection (read-only)
- `npm ls i18nextify --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on i18nextify.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-6457-mxpq-4fqq (OSV record GHSA-6457-mxpq-4fqq lists affected ranges: npm i18nextify >=0 <4.0.8 (fixed))
- Verified: https://github.com/advisories/GHSA-6457-mxpq-4fqq (GitHub-reviewed advisory GHSA-6457-mxpq-4fqq lists affected ranges: npm i18nextify >=0 <4.0.8)

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