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CKEditor4 Cross-site Scripting vulnerability caused by incorrect CDATA detection

Moderate severity GitHub Reviewed Published Feb 7, 2024 in ckeditor/ckeditor4 • Updated Mar 6, 2024

Package

composer ckeditor/ckeditor (Composer)

Affected versions

< 4.24.0

Patched versions

4.24.0
npm ckeditor4 (npm)
< 4.24.0-lts
4.24.0-lts

Description

Affected packages

The vulnerability has been discovered in the core HTML parsing module and may affect all editor instances that:

Impact

A potential vulnerability has been discovered in CKEditor 4 HTML processing core module. The vulnerability allowed to inject malformed HTML content bypassing Advanced Content Filtering mechanism, which could result in executing JavaScript code. An attacker could abuse faulty CDATA content detection and use it to prepare an intentional attack on the editor. It affects all users using the CKEditor 4 at version < 4.24.0-lts.

Patches

The problem has been recognized and patched. The fix will be available in version 4.24.0-lts.

For more information

Email us at [email protected] if you have any questions or comments about this advisory.

Acknowledgements

The CKEditor 4 team would like to thank Michal Frýba from ALEF NULA for recognizing and reporting this vulnerability.

References

@jacekbogdanski jacekbogdanski published to ckeditor/ckeditor4 Feb 7, 2024
Published by the National Vulnerability Database Feb 7, 2024
Published to the GitHub Advisory Database Feb 7, 2024
Reviewed Feb 7, 2024
Last updated Mar 6, 2024

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS score

0.059%
(26th percentile)

Weaknesses

CVE ID

CVE-2024-24815

GHSA ID

GHSA-fq6h-4g8v-qqvm

Source code

Credits

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