Description
CKEditor4 is an open source what-you-see-is-what-you-get HTML editor. A theoretical vulnerability has been identified in CKEditor 4.22 (and above). In a highly unlikely scenario where an attacker gains control over the https://cke4.ckeditor.com domain, they could potentially execute an attack on CKEditor 4 instances. The issue impacts only editor instances with enabled version notifications. Please note that this feature is disabled by default in all CKEditor 4 LTS versions. Therefore, if you use CKEditor 4 LTS, it is highly unlikely that you are affected by this vulnerability. If you are unsure, please contact us. The fix is available in version 4.25.0-lts.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ckeditor | ckeditor4 | >= 4.22.0, < 4.25.0-lts | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | request-tracker4 +1 | No fix yet | — |
| Ubuntu 25.10 | ckeditor +2 | No fix yet | — |
| Ubuntu 24.04 LTS | ckeditor3 +2 | No fix yet | — |
| Ubuntu 22.04 LTS | ckeditor3 +2 | No fix yet | — |
| Ubuntu 20.04 LTS | ckeditor3 +2 | No fix yet | — |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | ckeditor3 +1 | No fix yet | — |
| Ubuntu 16.04 LTS | request-tracker4 +1 | No fix yet | — |
| Ubuntu Pro 24.04 LTS | ckeditor | 4.22.1+dfsg1-2ubuntu0.24.04.1~esm1 | USN-7258-1 |
| Ubuntu Pro 22.04 LTS | ckeditor | 4.16.2+dfsg-1ubuntu0.1~esm1 | USN-7258-1 |
| Ubuntu Pro 20.04 LTS | ckeditor | 4.12.1+dfsg-1ubuntu0.1+esm1 | USN-7258-1 |
| Ubuntu Pro 18.04 LTS | ckeditor | 4.5.7+dfsg-2ubuntu0.18.04.1+esm1 | USN-7258-1 |
| Ubuntu Pro 18.04 LTS | request-tracker4 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | ckeditor | 4.5.7+dfsg-2ubuntu0.16.04.1~esm2 | USN-7258-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | ckeditor4 | >= 4.22.0, < 4.25.0 | 4.25.0 | GHSA-6v96-m24v-f58j |
Advisories 1
- USN-7258-1 ckeditor vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026