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8.2High

Ckeditor Ckeditor

CVE-2021-41164

CKEditor4 is an open source WYSIWYG HTML editor. In affected versions a vulnerability has been discovered in the Advanced Content Filter (ACF) module and may affect all plugins used by CKEditor 4. The vulnerability allowed to inject malformed HTML bypassing content sanitization, which could result in executing JavaScript code. It affects all users using the CKEditor 4 at version < 4.17.0. The problem has been recognized and patched. The fix will be available in version 4.17.0.

What this means for your business

  • It affects Ckeditor. It matters if your company, or a supplier that handles your data, runs it.
  • An attacker can use it remotely, over a network, with an ordinary user login, but only after tricking someone into an action such as opening a file or a link.
  • FIRST's prediction model gives it a 1% chance of attack attempts being seen in the next 30 days, ranking above 69% of all known flaws.

What to do

  1. 1Check whether your company or your suppliers run Ckeditor, and which version. The affected versions are listed further down this page.
  2. 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.

Not sure if your company is exposed?

Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.

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Scoring

CVSS
8.2 (v3.1)
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L
Weakness
CWE-79
Assigned by
security-advisories@github.com

Dates

Published
2021-11-17
Last modified
2026-08-25
Sources
NVD

Affected products

  • Ckeditor Ckeditor4.0 - 4.17.0
  • Drupal Drupal8.9.0 - 8.9.20, 9.1.0 - 9.1.14, 9.2.0 - 9.2.9
  • Oracle Banking Apis18.1 - 18.3, 19.1, 19.2, 20.1, 21.1
  • Oracle Banking Digital Experience18.1 - 18.3, 19.1, 19.2, 20.1, 21.1
  • Oracle Agile Product Lifecycle Management9.3.6
  • Oracle Application Express- 22.1
  • Oracle Commerce Guided Search11.3.2
  • Oracle Peoplesoft Enterprise Peopletools8.58, 8.59
  • Oracle Webcenter Portal12.2.1.3.0, 12.2.1.4.0
  • Fedoraproject Fedora36, 37

As listed in the NVD configuration data. Not a statement about your estate.

References