CVE-2017-6927: Debian Linux

Medium severity, CVSS 6.1. EPSS: 1.6% chance of exploitation in the next 30 days.

Drupal 8.4.x versions before 8.4.5 and Drupal 7.x versions before 7.57 has a Drupal.checkPlain() JavaScript function which is used to escape potentially dangerous text before outputting it to HTML (as JavaScript output does not typically go through Twig autoescaping). This function does not correctly handle all methods of injecting malicious HTML, leading to a cross-site scripting vulnerability under certain circumstances. The PHP functions which Drupal provides for HTML escaping are not affected.

Affected products

• Debian Debian Linux: version 7.0 only; version 8.0 only; version 9.0 only
• Drupal Drupal: from 7.0, before 7.57 (fixed in 7.57); from 8.4.0, before 8.4.5 (fixed in 8.4.5)

Published 2018-03-01. Last modified 2026-06-17.