GHSA-jv4c-7jqq-m34x

CKEditor 4 ReDoS Vulnerability

Source: GitHub Advisory Database (reviewed) Moderate CVE-2021-26271

Packages

Ecosystem	Package	Affected	Fixed in
npm	ckeditor4-dev	< 4.16	4.16

Details

As written in the advisory (Markdown source, shown as plain text).

It was possible to execute a ReDoS-type attack inside CKEditor 4 before 4.16 by persuading a victim to paste crafted text into the Styles input of specific dialogs (in the Advanced Tab for Dialogs plugin).

References

External links from the advisory. They lead to third-party sites.

https://nvd.nist.gov/vuln/detail/CVE-2021-26271 advisory
https://github.com/ckeditor/ckeditor4 package
https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-416 web
https://web.archive.org/web/20210128132707/https://ckeditor.com/blog/CKEditor-4.16-with-improved-image-pasting-High-Contrast-support-and-a-n… web
https://www.oracle.com//security-alerts/cpujul2021.html web
https://www.oracle.com/security-alerts/cpuoct2021.html web