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Cross-site scripting vulnerability in TinyMCE alerts

tinymce Updated 03 May 2024

Summary

08/12/2022
CVE-2022-23494
Yes i
Moderate
5.4

CVE-2022-23494: Cross-site scripting vulnerability in TinyMCE alerts. Affects tinymce versions < 6.3.1. Fixed in 6.3.1. How to fix ↓

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Impact

A cross-site scripting (XSS) vulnerability was discovered in the alert and confirm dialogs when these dialogs were provided with malicious HTML content. This can occur in plugins that use the alert or confirm dialogs, such as in the image plugin, which presents these dialogs when certain errors occur. The vulnerability allowed arbitrary JavaScript execution when an alert presented in the TinyMCE UI for the current user.

Patches

This vulnerability has been patched in TinyMCE 5.10.7 and TinyMCE 6.3.1 by ensuring HTML sanitization was still performed after unwrapping invalid elements.

Fix

To avoid this vulnerability:

  • Upgrade to TinyMCE 5.10.7 or higher for TinyMCE 5.x.
  • Upgrade to TinyMCE 6.3.1 or higher for TinyMCE 6.x.

Workaround

To reduce the impact of this vulnerability:

  • Ensure the the images_upload_handler returns a valid value as per the images_upload_handler documentation.

References

For more information

If you have any questions or comments about this advisory:

How To Fix

Latest published version: 8.10.0 as of 23 Oct 2026 

npm install tinymce@8.10.0

Upgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.

If you need the minimum change

6.3.1

This is the first release that contains the fix.

npm install tinymce@6.3.1

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Related vulnerabilities

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How To Fix

Latest published version: 8.10.0 as of 23 Oct 2026 

npm install tinymce@8.10.0

Upgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.

If you need the minimum change

6.3.1

This is the first release that contains the fix.

npm install tinymce@6.3.1

Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →

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