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Medium, CVSS 5.3amended

Code Snippet GeSHi plugin in CKEditor 4 has reflected cross-site scripting (XSS) vulnerability

CVE-2024-43407GHSA-7r32-vfj5-c2jv

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (ckeditor4 4.25.0; ckeditor/ckeditor 4.25.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
5.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N · score source
EPSS
  • CVE-2024-43407: 0.45% estimated exploitation activity in the next 30 days; percentile 39.13 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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 Patches The GeSHi library is no longer actively maintained.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…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-7r32-vfj5-c2jv

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-7r32-vfj5-c2jv

Agent brief

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# Patch Next advisory brief: CVE-2024-43407

Advisory: Code Snippet GeSHi plugin in CKEditor 4 has reflected cross-site scripting (XSS) vulnerability
IDs: CVE-2024-43407, GHSA-7r32-vfj5-c2jv
Record: https://patchnext.com/advisories/cve-2024-43407 (revision 3, source checked 26 Oct 2026, 12:36 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: ckeditor4 4.25.0; ckeditor/ckeditor 4.25.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm ckeditor4: affected < 4.25.0; fixed in 4.25.0
- Packagist ckeditor/ckeditor: affected < 4.25.0; fixed in 4.25.0

## Suggested inspection (read-only)
- `npm ls ckeditor4 --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- Packagist ckeditor/ckeditor: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on ckeditor4, ckeditor/ckeditor.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-7r32-vfj5-c2jv (OSV record GHSA-7r32-vfj5-c2jv lists affected ranges: npm ckeditor4 >=0 =0 <4.25.0 (fixed))
- Verified: https://github.com/advisories/GHSA-7r32-vfj5-c2jv (GitHub-reviewed advisory GHSA-7r32-vfj5-c2jv lists affected ranges: npm ckeditor4 >=0 =0 <4.25.0)

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