PT-2021-6878 · Unknown · Ckeditor 4

Published 2021-01-26 · Updated 2022-05-24 · CVE-2021-26271

Positive Technologies (AI Summary)

CVSS v2.0

7.1

High

Base vector

AV:N/AC:M/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions CKEditor 4 versions prior to 4.16

Description The issue is related to the inclusion of features from an untrusted controlled area in the Advanced Tab for Dialogs plugin of the CKEditor WYSIWYG editor. Exploitation of this issue could allow a remote attacker to spoof the contents of the address bar. It was possible to execute a ReDoS-type attack inside CKEditor 4 by persuading a victim to paste crafted text into the Styles input of specific dialogs in the Advanced Tab for Dialogs plugin.

Recommendations For CKEditor 4 versions prior to 4.16, update to version 4.16 or later to resolve the issue. As a temporary workaround, consider restricting access to the Styles input in the Advanced Tab for Dialogs plugin to minimize the risk of exploitation.

Fix

DoS

Weakness Enumeration

CWE-829

CWE-1333

Related Identifiers

BDU:2022-02395

CVE-2021-26271

GHSA-JV4C-7JQQ-M34X

Affected Products

Ckeditor 4

References · 18

• https://ubuntu.com/security/CVE-2021-26271 · Vendor Advisory
• https://oracle.com/security-alerts/cpuoct2021.html · Patch
• https://osv.dev/vulnerability/GHSA-jv4c-7jqq-m34x · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-26271 · Security Note
• https://cve.org/CVERecord?id=CVE-2021-26271 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-26271 · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-02395 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2021-26271 · Vendor Advisory
• https://oracle.com//security-alerts/cpujul2021.html · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-26271 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-26271 · Vendor Advisory
• https://ckeditor.com/blog/CKEditor-4.16-with-improved-image-pasting-High-Contrast-support-and-a-new-color-API/#security-comes-first · Vendor Advisory
• https://github.com/ckeditor/ckeditor4 · Note
• https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-416 · Note
• https://t.me/cibsecurity/22689 · Telegram Post