CVE-2021-37695 Execution of JavaScript code using malformed HTML in ckeditor
Attackers can execute arbitrary JavaScript code by injecting malformed HTML into CKEditor 4 fake objects, affecting all users of the library.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-37695?
CVE-2021-37695 is a high-severity cross-site scripting vulnerability in Debian Debian Linux, published on 12 Aug 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
ckeditor is an open source WYSIWYG HTML editor with rich content support. A potential vulnerability has been discovered in CKEditor 4 [Fake Objects](https://ckeditor.com/cke4/addon/fakeobjects) package. The vulnerability allowed to inject malformed Fake Objects HTML, which could result in executing JavaScript code. It affects all users using the CKEditor 4 plugins listed above at version < 4.16.2. The problem has been recognized and patched. The fix will be available in version 4.16.2.
Weakness: CWE-79
Which versions are affected by CVE-2021-37695?
2 open source packages ship an affected version, including ckeditor4. It affects 12 products.
| Package | Affected | Fixed in |
|---|---|---|
ckeditor4 npm | All versions | 4.16.2 |
ckeditor4 npm | All versions | 4.16.2 |
Products include Ckeditor Ckeditor, Debian Debian Linux, Fedoraproject Fedora, Oracle Application Express, Oracle Banking Party Management, Oracle Commerce Guided Search and 6 more.
How do I fix CVE-2021-37695?
Upgrade ckeditor4 to 4.16.2 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2021-37695 being exploited?
There is no known exploitation of CVE-2021-37695 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
- CVE-2023-31541 File upload in n/a
- CVE-2021-41164 Advanced Content Filter (ACF) vulnerability allowing to execute JavaScript code using malformed HTML
- CVE-2021-41165 HTML comments vulnerability allowing to execute JavaScript code
- CVE-2021-32808 Cross-site scripting in ckeditor via abuse of undo functionality
- CVE-2011-4972 Missing authorization in CKEditor Drupal module
Sources
Also known as DEBIAN-CVE-2021-37695, GHSA-m94c-37g6-cjhc, UBUNTU-CVE-2021-37695.