Vulnerability library
Security checkOctober 27, 2026

TinyMCE Cross-Site Scripting (XSS) vulnerability using media plugin `data-mce-object` serialization

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High severitynpmtinymce

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Description

Stored XSS vulnerability in the media plugin. Attackers can inject malicious scripts via elements crafted through the data-mce-object attribute, which are created and executed before sanitization. Impacts users of TinyMCE with the media plugin enabled.

Recommendation

Update the tinymce package to the latest compatible version. Followings are version details:

  • Affected version(s): **= 7.9.3 >= 8.5.1, < 8.9.3**
  • Patched version(s): **7.9.4 8.9.3**

References

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See something that needs correcting? Let us knowUpdated October 27, 2026