Cross-site scripting in CKEditor - CVE-2021-33829

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Main Vulnerability Database Vulnerabilities #VU53604

Cross-site scripting in CKEditor - CVE-2021-33829

Published: May 27, 2021 / Updated: June 15, 2021


Vulnerability identifier: #VU53604
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2021-33829
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.


Affected software

CKEditor
Arch Linux
Fedora
Ubuntu
Backdrop CMS
Drupal
IBM Engineering Requirements Management DOORS Next
IBM API Connect
ckeditor (Ubuntu package)
ckeditor

How to mitigate CVE-2021-33829

Install updates from vendor's website.

CKEditor - update to 4.16.1
Backdrop CMS - addressed in versions 1.18.5, 1.19.1
Drupal - addressed in versions 8.9.16, 9.0.14, 9.1.9
IBM Engineering Requirements Management DOORS Next - update to 9.7.2.8
IBM API Connect - addressed in versions 10.0.1.4, 10.0.3, 2018.4.1.17
ckeditor (Ubuntu package) - addressed in versions 4.5.7+dfsg-2ubuntu0.18.04.1, 4.12.1+dfsg-1ubuntu0.1, 4.16.0+dfsg-2ubuntu0.1
ckeditor - addressed in versions 4.16.2-1.el7, 4.16.2-1.fc33, 4.16.2-1.fc34, 4.16.2-1.fc35

External References

Related Security Bulletins