Code Snippet GeSHi plugin in CKEditor 4 has reflected cross-site scripting (XSS) vulnerability
Affected packages
The vulnerability has been discovered in Code Snippet GeSHi plugin. All integrators that use GeSHi syntax highlighter on the backend side can be affected.
Impact
A potential vulnerability has been discovered in CKEditor 4 Code Snippet GeSHi plugin. The vulnerability allowed a reflected XSS attack by exploiting a flaw in the GeSHi syntax highlighter library hosted by the victim.
The GeSHi library was included as a vendor dependency in CKEditor 4 source files. In a specific scenario, an attacker could craft a malicious script that could be executed by sending a request to the GeSHi library hosted on a PHP web server.
Patches
The GeSHi library is no longer actively maintained. Due to the lack of ongoing support and updates, potential security vulnerabilities have been identified with its continued use. To mitigate these risks and enhance the overall security of the CKEditor 4, we have decided to completely remove the GeSHi library as a dependency. This change aims to maintain a secure environment and reduce the risk of any security incidents related to outdated or unsupported software.
To integrators who still want to use the GeSHi syntax highlighter, we recommend manually adding the GeSHi library . Please be aware of and understand the potential security vulnerabilities associated with its use.
The fix is be available in version 4.25.0-lts.
Acknowledgements
The CKEditor 4 team would like to thank Jiasheng He from Qihoo 360 for recognizing and reporting this vulnerability.
For more information
Email us at security@cksource.com if you have any questions or comments about this advisory.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | ckeditor/ckeditor | < 4.25.0 | 4.25.0 |
| npm package | ckeditor4 | < 4.25.0 | 4.25.0 |
References
- https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-7r32-vfj5-c2jv
- https://nvd.nist.gov/vuln/detail/CVE-2024-43407
- https://github.com/ckeditor/ckeditor4/commit/71072c9f7f263329841bd38e7e5309074c82ef94
- https://github.com/ckeditor/ckeditor4/commit/951e7d75fcbcaa2590b0719fb0bb0dd0539ca6fa
- https://github.com/ckeditor/ckeditor4
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- Composer, npm
- Package
ckeditor/ckeditor, ckeditor4- Disclosed
- 21.08.2024
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-7r32-vfj5-c2jv - CC BY 4.0
Vulnerability history: ckeditor/ckeditor
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 4
- First → latest
- 11.2021 08.2024
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 3
Disclosures per year
- 2021: 1
- 2022: 1
- 2023: 0
- 2024: 2
- 2025: 0
- 2026: 0
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Code Snippet GeSHi plugin in CKEditor 4 has reflected cross-site scripting (XSS) vulnerability this entry
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