CVSS 3.1 Score 6.1 of 10 (medium)


Published Oct 19, 2023
Updated: Oct 26, 2023


CVE-2023-45818 is a mutation cross-site scripting (mXSS) vulnerability found in TinyMCE, an open-source rich text editor. The vulnerability affects TinyMCE versions 5 and 6. When a specially crafted HTML snippet bypasses the XSS sanitization layer, it undergoes manipulation as a string before being stored in the undo stack. If the HTML snippet is later restored from the undo stack, the combination of string manipulation and parsing can lead to the execution of malicious XSS payloads. This vulnerability has been patched in TinyMCE 5.10.8 and TinyMCE 6.7.1 by implementing node-level trimming instead of string manipulation. Users are advised to upgrade to these patched versions to mitigate the risk of exploitation.

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