CVE-2023-45818

Name of the Vulnerable Software and Affected Versions TinyMCE versions prior to 5.10.8 TinyMCE versions prior to 6.7.1

Description A mutation cross-site scripting (mXSS) vulnerability was discovered in TinyMCE’s core undo and redo functionality. When a carefully-crafted HTML snippet passes the XSS sanitisation layer, it is manipulated as a string by internal trimming functions before being stored in the undo stack. If the HTML snippet is restored from the undo stack, the combination of the string manipulation and reparative parsing by either the browser's native DOMParser API (TinyMCE 6) or the SaxParser API (TinyMCE 5) mutates the HTML maliciously, allowing an XSS payload to be executed. This vulnerability also impacts related TinyMCE APIs and plugins, including tinymce.Editor.getContent({ format: 'raw' }), tinymce.Editor.resetContent(), and the Autosave Plugin.