XSS vulnerability when rendering filename in Webform Multiform

Vulnerability Description

Webform Multiple File Upload module for Drupal 7.x contains a cross-site scripting (XSS) vulnerability in the file name renderer. An unauthenticated attacker can exploit this vulnerability by uploading a file with a malicious filename containing JavaScript code (e.g., "<img src=1 onerror=alert(document.domain)>") to a Webform node with a Multifile field where file type validation is disabled. This allows the execution of arbitrary scripts in the context of the victim's browser. The issue is present in a third-party library and has been addressed in a patch available at  https://github.com/fyneworks/multifile/pull/44 . Users are advised to apply the provided patch or update to a fixed version of the module.

References

• https://www.drupal.org/node/3105204
• https://www.d7security.org/security-advisories/D7SECURITY-SA-CONTRIB-2025-001/
• https://www.herodevs.com/vulnerability-directory/cve-2025-12848
• https://d7es.tag1.com/security-advisories/webform-multiple-file-upload-critical-cross-site-scripting