Description
CKEditor 5 is a modern JavaScript rich-text editor with an MVC architecture. During a recent internal audit, a Cross-Site Scripting (XSS) vulnerability was discovered in the CKEditor 5 real-time collaboration package. This vulnerability affects user markers, which represent users' positions within the document. It can lead to unauthorized JavaScript code execution, which might happen with a very specific editor and token endpoint configuration. This vulnerability affects only installations with Real-time collaborative editing enabled. The problem has been recognized and patched. The fix is available in version 44.2.1 (and above). Users are advised to upgrade. There are no known workarounds for this vulnerability.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ckeditor | ckeditor5 | @ckeditor/ckeditor5-real-time-collaboration: >= 41.3.0, < 44.2.1, ckeditor5-premium-features: >= 42.0.0, < 44.2.1 | — |
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 | No fix yet | — |
| Ubuntu Pro 22.04 LTS | ckeditor | No fix yet | — |
| Ubuntu Pro 20.04 LTS | ckeditor | No fix yet | — |
| Ubuntu Pro 18.04 LTS | ckeditor +1 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | ckeditor | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | @ckeditor/ckeditor5-real-time-collaboration | >= 41.3.0, < 44.2.1 | 44.2.1 | GHSA-j3mm-wmfm-mwvh |
| npm | ckeditor5-premium-features | >= 42.0.0, < 44.2.1 | 44.2.1 | GHSA-j3mm-wmfm-mwvh |