CVE-2021-32808

Cross-site scripting in ckeditor via abuse of undo functionality

Description

ckeditor is an open source WYSIWYG HTML editor with rich content support. A vulnerability has been discovered in the clipboard Widget plugin if used alongside the undo feature. The vulnerability allows a user to abuse undo functionality using malformed widget HTML, which could result in executing JavaScript code. It affects all users using the CKEditor 4 plugins listed above at version >= 4.13.0. The problem has been recognized and patched. The fix will be available in version 4.16.2.

Category

7.6
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 1.22% Top 25%
Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org
Affected: ckeditor ckeditor4
Published at:
Updated at:

References

Link Tags
https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-6226-h7ff-ch6c third party advisory
https://github.com/ckeditor/ckeditor4/releases/tag/4.16.2 third party advisory release notes
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NYA354LJP47KCVJMTUO77ZCX3ZK42G3T/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UVOYN2WKDPLKCNILIGEZM236ABQASLGW/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WAGNWHFIQAVCP537KFFS2A2GDG66J7XD/ vendor advisory
https://www.oracle.com/security-alerts/cpuoct2021.html third party advisory patch
https://www.oracle.com/security-alerts/cpujan2022.html third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2021-32808?
CVE-2021-32808 has been scored as a high severity vulnerability.
How to fix CVE-2021-32808?
To fix CVE-2021-32808, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-32808 being actively exploited in the wild?
It is possible that CVE-2021-32808 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-32808?
CVE-2021-32808 affects ckeditor ckeditor4.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.