A vulnerability was identified in tarteaucitron.js where document.currentScript was accessed without verifying that it referenced an actual <script> element. If an attacker injected an HTML element such as:

<img name="currentScript" src="https://malicious.example.com">

it could clobber the document.currentScript property. This causes the script to resolve incorrectly to an element instead of the <script> tag, leading to unexpected behavior or failure to load the script path correctly.

This issue arises because in some browser environments, named DOM elements (e.g., name="currentScript") become properties on the global document object.

Impact

An attacker with control over the HTML could exploit this to change the CDN domain of tarteaucitron.

Fix AmauriC/tarteaucitron.js@230a3b6

The issue was resolved by verifying that document.currentScript is an instance of HTMLScriptElement. If not, the script now falls back safely to the last <script> tag on the page.

References

• GHSA-q43x-79jr-cq98
• AmauriC/tarteaucitron.js@230a3b6
• https://nvd.nist.gov/vuln/detail/CVE-2025-48939