CVE-2021-26271 CKEditor 4 ReDoS Vulnerability
An attacker can cause a denial of service in CKEditor 4 by tricking a user into pasting crafted text into specific dialog inputs.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-26271?
CVE-2021-26271 is a medium-severity denial of service vulnerability in Oracle Agile Product Lifecycle Management, published on 26 Jan 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
It was possible to execute a ReDoS-type attack inside CKEditor 4 before 4.16 by persuading a victim to paste crafted text into the Styles input of specific dialogs (in the Advanced Tab for Dialogs plugin).
Weakness: CWE-829
Which versions are affected by CVE-2021-26271?
2 open source packages ship an affected version, including ckeditor4-dev. It affects 7 products.
| Package | Affected | Fixed in |
|---|---|---|
ckeditor4-dev npm | All versions | 4.16 |
ckeditor4-dev npm | All versions | 4.16 |
Products include Ckeditor Ckeditor, Oracle Agile Product Lifecycle Management, Oracle Application Express, Oracle Financial Services Analytical Applications Infrastructure, Oracle Jd Edwards Enterpriseone Tools, Oracle Siebel Ui Framework and 1 more.
How do I fix CVE-2021-26271?
Upgrade ckeditor4-dev to 4.16 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-26271 being exploited?
There is no known exploitation of CVE-2021-26271 in the wild and no public exploit code.
Other vulnerabilities in Oracle Agile Product Lifecycle Management
- 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
All Oracle Agile Product Lifecycle Management vulnerabilities
Sources
Also known as DEBIAN-CVE-2021-26271, GHSA-jv4c-7jqq-m34x, UBUNTU-CVE-2021-26271.