Vulnerability · Published Nov 17, 2021 · Assigned by GitHub_M
CVE-2021-41164Advanced Content Filter (ACF) vulnerability allowing to execute JavaScript code using malformed HTML
High 8.2
In plain English
A high-severity cross-site scripting in ckeditor4 from ckeditor. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.3% (higher than 72% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | ckeditor | 4.19.0+dfsg-1 | DEBIAN-CVE-2021-41164 |
| Ubuntu:22.04:LTS | ckeditor3 | no fix listed | UBUNTU-CVE-2021-41164 |
| Ubuntu:24.04:LTS | ckeditor3 | no fix listed | UBUNTU-CVE-2021-41164 |
| Ubuntu:22.04:LTS | ldap-account-manager | no fix listed | UBUNTU-CVE-2021-41164 |
| Ubuntu:24.04:LTS | ldap-account-manager | no fix listed | UBUNTU-CVE-2021-41164 |
| Ubuntu:25.10 | ldap-account-manager | no fix listed | UBUNTU-CVE-2021-41164 |
| Ubuntu:26.04:LTS | ldap-account-manager | no fix listed | UBUNTU-CVE-2021-41164 |
| Ubuntu:22.04:LTS | request-tracker4 | no fix listed | UBUNTU-CVE-2021-41164 |
| Ubuntu:24.04:LTS | request-tracker4 | no fix listed | UBUNTU-CVE-2021-41164 |
| Ubuntu:25.10 | request-tracker4 | no fix listed | UBUNTU-CVE-2021-41164 |
| Ubuntu:26.04:LTS | request-tracker4 | no fix listed | UBUNTU-CVE-2021-41164 |
| npm | ckeditor4 | 4.17.0 | GHSA-pvmx-g8h5-cprj |
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L
References
- https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-pvmx-g8h5-cprj
- https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-417
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.drupal.org/sa-core-2021-011
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://www.oracle.com/security-alerts/cpujul2022.html
- FEDORA-2022-b61dfd219b vendor-advisory
- FEDORA-2022-4c634ee466 vendor-advisory