Advisory Published
CVE Published

CVE-2023-48219: Special characters in unescaped text nodes can trigger mXSS in TinyMCE

First published: Wed Nov 15 2023(Updated: )

TinyMCE is an open source rich text editor. A mutation cross-site scripting (mXSS) vulnerability was discovered in TinyMCE’s core undo/redo functionality and other APIs and plugins. Text nodes within specific parents are not escaped upon serialization according to the HTML standard. If such text nodes contain a special character reserved as an internal marker, they can be combined with other HTML patterns to form malicious snippets. These snippets pass the initial sanitisation layer when the content is parsed into the editor body, but can trigger XSS when the special internal marker is removed from the content and re-parsed. his vulnerability has been patched in TinyMCE versions 6.7.3 and 5.10.9. Users are advised to upgrade. There are no known workarounds for this vulnerability.


Affected SoftwareAffected VersionHow to fix
Tiny Tinymce<5.10.9
Tiny Tinymce>=6.0.0<6.7.3

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Frequently Asked Questions

  • What is CVE-2023-48219?

    CVE-2023-48219 is a mutation cross-site scripting (mXSS) vulnerability discovered in TinyMCE's core undo/redo functionality and other APIs and plugins.

  • What is the impact of CVE-2023-48219?

    The impact of CVE-2023-48219 is that special characters in unescaped text nodes can trigger mXSS in TinyMCE.

  • What is the severity of CVE-2023-48219?

    The severity of CVE-2023-48219 is medium with a CVSS score of 6.1.

  • How can I fix CVE-2023-48219?

    To fix CVE-2023-48219, update TinyMCE to version 5.10.9 for the 5.x branch or to version 6.7.3 for the 6.x branch.

  • Where can I find more information about CVE-2023-48219?

    You can find more information about CVE-2023-48219 in the GitHub advisory (, the release notes for version 5.10.9 (, and the release notes for version 6.7.3 (


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