TinyMCE is an open source rich text editor. 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](https://developer.mozilla.org/en-US/docs/Web/API/DOMParser) (TinyMCE 6) or the SaxParser API (TinyMCE 5) mutates the HTML maliciously, allowing an XSS payload to be executed. This vulnerability has been patched in TinyMCE 5.10.8 and TinyMCE 6.7.1 by ensuring HTML is trimmed using node-level manipulation instead of string manipulation. Users are advised to upgrade. There are no known workarounds for this vulnerability.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2023-10-19T21:18:01.297Z

Updated: 2024-09-12T15:36:41.178Z

Reserved: 2023-10-13T12:00:50.438Z

Link: CVE-2023-45818

cve-icon Vulnrichment

Updated: 2024-08-02T20:29:32.376Z

cve-icon NVD

Status : Analyzed

Published: 2023-10-19T22:15:10.817

Modified: 2023-10-26T16:32:24.767

Link: CVE-2023-45818

cve-icon Redhat

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