CVE-2020-27193

The CKEditor v1.2.3 plugin for Redmine has an unrestricted file upload vulnerability in the 'Browse and upload images' feature, allowing arbitrary files to be uploaded to the server.

CKEditor 4.0 before 4.14 contains a cross-site scripting (XSS) vulnerability in the HTML Data Processor. A remote attacker can inject arbitrary script through a crafted "protected" comment (with the cke_protected syntax).

CKEditor 5 is a modern JavaScript rich-text editor with an MVC architecture. From 45.0.0 until 47.7.4 and 48.5.1, the engine uses a vulnerable es-toolkit version whose prototype-pollution behavior can be reached while CKEditor processes incoming style attribute values. Crafted editor content can thereby cause unauthorized JavaScript execution in the browser. This issue is fixed in versions 47.7.4 and 48.5.1.

In CKEditor 5 from 29.0.0 until 47.7.4 and 48.5.1, specially crafted markup can trigger cross-site scripting when General HTML Support is enabled and specifically configured to allow object content. Processing that content can execute attacker-controlled JavaScript in a browser context isolated from the origin of the application embedding the editor. This issue is fixed in versions 47.7.4 and 48.5.1.

In CKEditor 4 before 4.16, it was possible to execute a ReDoS-type attack by persuading a victim to paste crafted URL-like text into the editor, and then press Enter or Space (in the Autolink plugin).

In CKEditor 4 before 4.16, it was possible to execute a ReDoS-type attack by persuading a victim to paste crafted text into the Styles input of specific dialogs (in the Advanced Tab for Dialogs plugin).